Depends on what you do. I partial feed for 9 months before I put in the "steps" to stop. Stop by gradually reducing one pump (I'm assuming no more direct bf?) every few days. They say wear tight sports bra around the house helps (never try) but increasing your workout pace during this period "stresses" the body as you ramp the workout so reduces milk. No underwire or you will get clog ducts, not stop the milk. As you gradually reduce the pump one by one every few days, initially may feel a bit full so stretch out a few more days before reducing another pump. Once milk slows down, it stops pretty fast. Think I took 2 weeks but I was not doing direct feeding for 9 months by then.