In general you have to be in school all the time the school is open and for other meetings that would be directed time for staff - so you typically must be in school from 8:30 to about 3:30 (depending on the school's hours) and you should be present for the (normally weekly) pre-school meetings and will need to stay to any after school department or whole school meetings (typically one hour, starting at 4:00pm, again depending on the school and never more than once a week if that). I wrote should above because it's usually possible to negotiate not going to staff meetings and, some schools don't actually expect you to anyway (though going to them can be very informative for a trainee. In fact, they can be a lot more interesting to trainees than they are to staff who may well have "heard it all before"..) Most trainees are actually in school longer hours than the above as most find it useful to have access to the school IT systems, resources and classrooms when preparing their lessons. But you don't have to do that. And it is possible to negotiate not having to be present all the time the school is open. That may complicate things with getting you a placement that works, but it can be done.