I'm just going to list off all of the crimes and other stuff Johnny and Dukey did:
1. Johnny and Dukey save the town from a Monkey.
2. Johnny and Dukey stop a train from falling off the a cliff.
3. Johnny and Dukey save a guy from falling off a cliff.
4. Johnny and Dukey stop criminals from robbing the bank.
5. Johnny and Dukey stop another train from falling off a cliff.
6. Johnny and Dukey stop a building from burning.
7. Johnny and Dukey stop trains from crashing into each other.
8. And finally, Johnny and Dukey help the Mayor open a pickle jar (comedic purposes only).
They did all of this without taking a break, and after Johnny opened the pickle jar, they become completely exhausted, and then Dukey states they haven't slept in 3 days.
After that,
they tell Johnny's sisters they were right about living the super hero lifestyle. They all then formulate a plan to "destroy" Johnny X and Super Dukey.
Then both Johnny and Dukey tank this. This was after they complained about not sleeping for 3 days, and they took a very short break.
Then, a little after,
they even took a beating from Johnny's sisters.
So even after fighting crime and saving people danger for 3 straight days before betting tired, they were willing to take even more damage after. They did all of this, while only getting very small breaks after stating they haven't slept in 3 days.
This shows how much stamina Johnny has, and how resilient he is.