Do you think I could go from 7:50-12:05 without pumping?

I am a teacher, so I will have limited time to pump when I go back to work. I have duty from 7:50-8:15, so will pump before then, and then have lunch at 12:05 and a prep period at either 1:35 or 2:15 depending on the day of the week.

Do you think I can from 7:50-12:05? I’m worried I’ll be bursting.

School doesn’t start until August, so I wanted to get on this sort of pumping schedule a few weeks before school starts. What do you think?