With the recent discussions in other verses about planets bigger than Earth I could't help to think about that but with Tortus and maybe Tortus is bigger than our Earth?
There is the thing about Tortus moon been far bigger than Earth's moon:
A moon much larger than the earth’s moon illuminated the ocean’s surface. Short Stories, Bonus Chapter - The Most Beautiful Perverted Dragon
At 300 km away from Erisen the ocean depth is of 100 km:
They traveled roughly three hundred kilometers northwest.
That was where the Sunken Ruins of Melusine were hidden, according to Miledi Reisen.
However, they hadn’t had time to get its precise location out of her before she’d flushed them out. On top of that, she’d mentioned something about the moon, and needing Gruen’s crest.
For now, Hajime decided to find the ruins’ location, and then go from there. They arrived at the location Miledi had mentioned around noon, and began searching the bottom of the ocean. Unfortunately, they found nothing of note. Since it was a sunken ruin, Hajime had expected to find some trace of it on the floor, but there was nothing.
The only difference was the depth. The surrounding areas were around one hundred kilometers deep, but the supposed location of the ruins was slightly shallower. Vol 5, Chapter II
Whereas the average Sea Floor in real life is less than 4 km deep, and the deepest part of the sea in real life is the Challenger Deep, which is 10.9 km deep.
There exist something like the Mountain Range with mountains that reach the 8000 kilometers and with different environments between each of them:
The Northern Mountain Range. Mountains ranging from 1000 meters above sea level to 8000 meters above sea level existed within the range, and the flora and even environment varied drastically from mountain to mountain. One mountain might be covered in trees with leaves the vibrant color of fall, but the next mountain over would be a dense green jungle. And then there were mountains that resembled desolate wastelands.
Moreover, no matter how many mountains one scaled, they would only see a sea of mountains extending infinitely northward. The first four rows of mountains had been somewhat explored, but past that was unknown territory.
A number of ambitious adventurers had tried mapping the entire range, but as the strength of the monsters grew with each progressive mountain, no one had yet managed to scale the fifth row.
The highest mountain in the first row was the so-called Sacred Mountain where the Holy Church’s headquarters were. Vol 3, Chapter II
Which obviously don't exist in Earth, there also exist other things like the Reisen Gorge, the Gruen Dessert, etc., that are different to Earth and don't know if they could be possible with a planet the size of Earth or similar to it in environment, though this point isn't that important since is normal in isekais unique places. There is also the fact that Tortus only seem to have one continent.
The atmosphere also seem to be different considering how people can breath without problem at the peak of the Sacred/Divine Mountain:
Though even if there hadn’t been any bars over her window, she wouldn’t have been able to escape. Her cell was at the top of a tower on the summit of the Divine Mountain. It was unlikely she could reach the ground without dying, and even if she could, the mountain was crawling with priests. Avoiding all of them and making it back to the capital was an impossible task. Vol 5, Chapter II
Though the mountain itself was made of rock, it was inhabited by people.
That meant there were plenty of things lying around for Aiko to ferment.Though this was Tortus and not earth, most organic materials still emitted a gas similar to methane when they fermented.
So she’d fermented everything she could reach, filling the church with a flammable gas. Since Fermentation wasn’t an offensive spell, the cathedral’s barrier hadn’t blocked it. It had to let things like gas and air through, or the people inside wouldn’t be able to survive after all. Tio had used wind magic to control the atmosphere around it too, making sure the gas didn’t disperse. Vol 5, Chapter III
Also a curiosity I discovered when searching things, I finded the distance from the dragonmen village to the continent. This based in how Tio despite travel at 600 km/hr (based in how she covered 100 km in 10 minutes of flight):
Before the messenger even finished, Venri transformed and took flight. She raced southward as fast as possible, her azure scales scintillating in the noon light. She opened her eyes as wide as they could go and desperately scanned the horizon for a black speck.
It was only after she’d gone a hundred kilometers or so that she remembered Cartus’ Job was Observer, which allowed him to see across immense distances.
I may have been a tad hasty... But just as she thought that, she spotted something.
“P-Princess!?”
Venri could never mistake that distinctive luster of Tio’s obsidian-colored mana. But to her surprise, it wasn’t a black speck she spotted in the distance. Instead, she saw a whirling, pitch-black tornado. The tornado was perfectly horizontal and tapered at the front. It was still a few kilometers away, but was approaching at blistering speed.
...
Tio shot forward, creating that same black tornado she had before. She moved so fast that even her wind barrier couldn’t fully protect Venri from the air resistance.
In less than ten minutes, Tio reached the island. Vol 11, Extra Chapter
She took around a day and some hours to reach the dragon village from Garland (this without rest since there wasn't extra time for something like that and because she have the stamina to do so in one go), this based in the fact of how she spend a day and half resisting the conceptual maddness and a few hours resting after that:
After a few minutes, Cartus arrived at the mausoleum... and the other villagers started trickling in behind him. They had all seen the violent eruption of mana that had occurred when Tio touched the scale. Adul explained the situation to them, but he kept his eyes on Tio the entire time. He wanted to witness the moment his granddaughter became the strongest dragonman in history.
A day and a half passed, and finally, Tio unleashed a breath attack so powerful it blew away the dark clouds that had begun to gather around the dragonmen island. It was stronger than the final attack Kharga had unleashed, and it appeared to go so high it reached the heavens themselves.
Late that night, the dragonmen warriors gathered once more at the central plaza. Tio stood before them, looking more confident than ever.
After clearing the trial in the mausoleum, she had been so exhausted that Adul had needed to carry her back to the mansion. However, after spending a few hours under Venri’s ministrations, she was back to full strength. Vol 11, Extra Chapter
And how there were just 12 hours left of the 3 days countdown when Hajime went to the Kingdom and a bit after arrieved Tio through a portal:
It was one hour before the clock would strike midnight, signaling the start of the day of Ehit’s invasion.
Shea, Kaori, Suzu, and Ryutarou had spent the entire time in the workshop with the Hour Crystal, training with their new artifacts.
Kaori, Suzu, and Ryutarou had just left for the surface, while Hajime and Shea were going over their final preparations.
“Tomorrow’s the day...”
“Yeah. Though, Ehit never specified the exact time he’d start.”
If Ehit had meant exactly three days from the moment of his declaration, then there were still about twelve hours left.
Of course, it was possible that he’d attack as soon as the day started or just before it ended too. Vol 11 Chapter IV
Though in the end Ehit begun the invasion when there were around seven hours left (in the case that is considered that at 6:00 am begin dawn, and if it help to determine at which hour they sun could appear they were in summer, specifically around July based in the date given in other point of the story):
Eventually, dawn arrived. The sun’s rays crested the horizon, causing everyone to cast long shadows. Warm light suffused the air, and right when the sun became fully visible, Hajime opened his eyes.
“They’re here.”
A second later, dark crimson mana filled the air, blotting out the orange sunrise. Vol 11 Chapter IV
So if I know to do math correctly Tio traveled 14,400-16,200 km in straight line (depending if she traveled 24 hours or 27 hours considering the extra hours that she seem to have took), so that's the distance between the continent and the dragonmen village, which curiously is almost the distance between Japan and my country Venezuela (14,600 km).
As a side note despite how much is the distance between both, the continent and the dragonmen village, in both places was late in night:
It was nearly midnight, but it looked like it was mid-afternoon. Lights too bright and too big to be stars twinkled in the night sky, illuminating the surroundings. They were artifacts Hajime had sent up to allow construction to progress through the night, and to give the defenders an edge if the battle dragged on into the night. Vol 11 Chapter IV
Late that night, the dragonmen warriors gathered once more at the central plaza. Tio stood before them, looking more confident than ever.
After clearing the trial in the mausoleum, she had been so exhausted that Adul had needed to carry her back to the mansion. However, after spending a few hours under Venri’s ministrations, she was back to full strength.
“My brethren, we shall now head to the battlefield which will determine the fate of this world.”
Her words resonated in the hearts of everyone listening.
“It has been a long five centuries of living in hiding, but the time has finally come to announce our presence to the world once more! The people of Tortus need our help! We are their guardians, the keepers of the peace! We are the legendary dragonmen the world needs right now!”
Choked with emotion, the warriors raised their fists into the air.
“Once a dragon loses its benevolence, it is nothing more than a beast. But so long as the blade of reason is our weapon—” Tio chanted.
“We are not beasts, but dragonmen!” everyone roared in reply.
Everyone’s hearts swelled with pride.
Be noble in all that you do. Use your might for the sake of others.
That was one of the dragonmen’s core precepts, and on that day, everyone knew they were embodying that ideal.
Tio deployed the artifact Hajime had given her, and a shimmering portal of light appeared in front of her. There was a burst of black mana, and she transformed into her majestic dragon form. Vol 11, Extra Chapter
This despite how there should be like 13 hours of difference (at least based in the hour difference between Japan and Venezuela which is 14,604 km) between the continent and the dragonmen village, this could support the idea that Tortus is bigger than Earth or could be a side effect of the bigger moon in Tortus, honestly don't know.
Now I will try to find more differences in Zero. I think that know if Tortus is bigger than real life Earth could be helpful in a future so just in case I will try to open my eyes.
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