Returning to work

Brittany • Mother of 2 boys( 6/11/08 and 7/4/17) DH had vasectomy, IVF fresh cycle #1 BFP November 2016, Baby born Independence Day 2017, can't wait for baby #3 in a few years! 👶🏽💙❤️💙❤️

I have been exclusively breastfeeding and have stored probably about 3 gallons of milk so far. I'm 11 weeks pp and return to work on Monday. How often should I pump at work? I work from 9-530 but will be dropping the baby off at daycare at 730. I really would like to keep my supply up.