First off, it depends on which aircraft you choose. CRJ after indoc you'll have 5 days to get them done on your own time. ERJ i'm not sure how different its structured but you'll have the CBTs and a systems class after.
You can do it at 6pm or you can do them at midnight. Being that everyone has the gouges with the answers you can blast through them if you want with out learning a thing. (Don't do that, had one person do that in three days and had trouble keeping up)
It's risky to go home if you're a number of hours away, but doable. Just have to stick your nose in it for a number of uninterrupted hours. It's not part of the course, let alone mentioned, but You will find yourself looking through the Reference manual because the CBTs only go so far describing what ever system you're on.