Pump schedule

FTM & I just started going back to school after my maternity leave. So far I’ve been breastfeeding Friday-Monday afternoon, but exclusively pumping Monday evening-Thursday because I don’t see her at all those days. School has been pretty hectic because I’m trying to make up a lot. I feel like I’m slacking on pumping, which I do 1-3x a day depending on how much work I need to get done.. They say you’re suppose to pump to replace a feeding but I can’t go to my classes, do my assignments/homework, & pump that often. I need advice on how to stick to a pumping schedule that would work best. What do you do to make sure to you regulate your milk supply?