Teacher pumping schedules

I'm due in August with my 2nd and I'm getting worried about how I'm going to pump at school and how many times. My last pregnant I was at a different school and they wouldn't give me breaks and I had to pump in a closet with a curtain or they gave me the choice of a nasty janitor closet. I know a lot of how my principal treated me was against the law. I should done something. So I just want to make sure that this time that I do it right and get to continue breast feeding. So what are your teacher pumping schedules like?

Ps I have conference at 10:15 to 11:15 and lunch at 11:55- 12:20