Here's the problem: It's dangerous. I'm not talking about the sexual abuse that happens in school or the potential to find yourself in a dangerous or compromising situation with a student. That does happen and accusations do get made, so keep your hands of the kids, keep your door open, meet in public places, and keep your head on a swivel if you are someone who does home visits. I'm talking about ensuring that both you and your students are protected mentally and emotionally.
If your district or school doesn't set cut off times for student teacher contact, set one. 9pm is probably more than fair if you're a talk to kids outside the school day kind of teacher. Two reasons you should. Reason the first, you need to shut it off at some point or you'll go crazy. Period. You need time to do your own teacher work and live your life. Without that you'll always be behind and exhausted. That's no way to teach. Second, kids need to understand that you won't always be there to hold their hand through every assignment whenever they want your attention. That stunts their development as well.
This is a topic with a ton of different parts to discuss. We'll probably do so.