Room of time is infinite in size
[A future lone warrior!!! Underwear]
"I continued to star my father's back if I was in a trance. Then I was suddenly seized by an impulse to run after him, wouldn't the father disappear into that infinite space the moment he walked through the door, I had a feeling.
Fourth, but the surroundings remain a constant bright iridescent white aurora. Its reflective floor is of undefined area, and the boundaries of the Room are believed to extend to infinity in all directions, although it appears to have a definite atmosphere.
Trunks novel source
The history and English translation of the special Trunks side story by Aya Matsui and Minoru Maeda
www.kanzenshuu.com