Partner goes back to teaching next month. How did pumping at school work for you?

Our daughter is 7 months old and my partner's maternity leave ends in October. My partner teaches at a school where the staffroom is shared and there's no separate room for anything. The baby is on solids twice a day now but still feeds a lot otherwise. My partner will handle it their own way; I'm just trying to help with the logistics. If you or your partner went back to a school job while still feeding, what did you work out with the school? A free period every day, an empty classroom, going home at lunch? Also, does a cooler bag survive the Chembur local in the afternoon 😂