will pumping at work every 3-4 hours keep my supply up?

Ahhh ok

I'd try to aim closer to the 3 hrs just to be safe. Also because the pump won't be as effective as your baby. Best wishes reaturning to work

@arivera64, he's a cluster feeder when Im home. Then at night he goes 3-4 hours

you should pump as often as you nurse. So if you nurse every 3 to 4 hrs then yes.

It should