Epitech student here (42 is kind of a fork, the whole managing team is Epitech Alumni).
So far they copied everything from Epitech and it seems to work in the same way so:
1) Mentors should be available at 2 in the morning. Not that they have to (most of the time) it's just that you mostly interact with teaching assistants that still are in school working on their projects too, so they usually pull the same kind of hours than you.
2) You have really tight deadlines and a huge amount of project so it's not unusual to have to work 15 hours. But the whole thing is just about learning to manage crazy constraints, you deal with it the way you want. If you choose to work 15hours a day an manage to be efficient then great, but it's more about learning to be organize / be efficient.
1) Mentors should be available at 2 in the morning. Not that they have to (most of the time) it's just that you mostly interact with teaching assistants that still are in school working on their projects too, so they usually pull the same kind of hours than you.
2) You have really tight deadlines and a huge amount of project so it's not unusual to have to work 15 hours. But the whole thing is just about learning to manage crazy constraints, you deal with it the way you want. If you choose to work 15hours a day an manage to be efficient then great, but it's more about learning to be organize / be efficient.