Depends on the situation.
If I'm bored and have nothing else, I'll get on tb. If someone goes "Ohai get awn pass is wfninfio" there's a 90% chance of me actually going, but it would probably take time because I'm doing other stuff.
Normally later hours, maybe about 3:00pm-1:30am(2 hour delay schooled, if normal day about 12:30AM(midnight)). If i'm having a great time(which is often) I would probably stay on until 4-5:00 AM, or until my mom notices I'm still awake.