Going back to work and pumping?

Hi ladies, I’m starting to think about when I go back to work in a few weeks. I would like to try my hardest to get as much breastmilk as possible but I also don’t have too much pressure because my daughter will take formula bottles. My question is what is a recommended amount of time for pumping? I plan to pump in the car on my way to work, pump in the middle of the day/during my lunch, and pump on the way home. I also currently plan to continue pumping in the middle of the night while my daughter does her long sleep stretch. Thanks for your advice. Every pump I do now is after a feeding with the exception of the middle night feed and I keep them to only 20 minutes so I don’t constantly have something or someone attached to the breasts.