Pumping frequency when back at work?

Kelly • Mama to 1 toddler girl (and baby boy due in August!)

For the mamas who work outside the home and pump while at work: how often do you pimp? And for how long each session? I’ll be leaving for the office ~7:30am and getting home around 4:45pm. Thinking I’ll aim for 4 sessions @ 20 minutes each. Thoughts?? Those already back at work, what is working for you?!