Most people should pump for about 15 to 20 minutes per breast, or roughly 20 minutes total if using a double electric pump on both sides at once. The exact time depends on your stage postpartum, your supply, and whether milk is still flowing when you think about stopping.
The real answer isn’t a fixed number on a clock. It’s about pumping until your breasts feel soft and milk stops flowing, then continuing for a couple of minutes beyond that point. Here’s how to fine-tune that timing for your situation.
The General Rule for Each Session
A full pumping session typically takes about 20 minutes of active pumping. If you’re pumping one breast at a time, that means roughly 15 to 20 minutes per side. If you’re using a double pump (both breasts simultaneously), you can finish in about 15 to 20 minutes total since both sides empty at once.
A good stopping point is about two minutes after you see the last drops of milk come out. This ensures you’ve drained the breast thoroughly, which is the single most important signal your body uses to decide how much milk to make next time. Stopping too early on a regular basis can gradually reduce your supply, while pumping to completion tells your body to keep production steady or increase it.
Plan for 30 to 40 minutes if you include setup and cleanup time, especially if you’re pumping at work or away from home.
Why Double Pumping Saves Time
Pumping both breasts at the same time cuts your session length nearly in half compared to doing one side, then the other. It also produces more milk. Research comparing the two approaches found that simultaneous double pumping consistently yielded higher milk volumes than pumping each breast separately, even when total pumping time was the same. Fat content in the milk stayed about the same either way.
If you’re exclusively pumping or pumping at work with limited break time, a double electric pump is worth the investment. You’ll get more milk in less time, which matters when you’re fitting sessions into a busy schedule.
Timing Changes in the First Two Weeks
Your milk goes through distinct phases in the early days, and pumping duration shifts with each one.
During the first one to three days, you’re producing colostrum, a thick, concentrated early milk that comes in very small amounts. Sessions may only yield drops or a few milliliters, and you might pump for 10 to 15 minutes per side without seeing much. That’s normal. The goal at this stage is stimulation, not volume. Your body is learning from the frequency of those signals.
Around days three to five, transitional milk starts coming in. Sessions get longer because there’s more milk to remove. Once your milk has fully come in, usually by the end of the first two weeks, a typical session runs 20 to 30 minutes and you’ll have a clearer sense of when flow tapers off.
How Often Matters More Than How Long
Pumping frequency has a bigger impact on your milk supply than the length of any single session. Women who aim for eight pumping sessions in a 24-hour period tend to build and maintain a strong supply. Pumping volume and frequency by the fourth day after birth are significant predictors of supply at six weeks.
Starting early matters too. Women who begin pumping within the first hour after birth produce significantly more milk at three weeks compared to those who start at six hours. If you’re separated from your baby in the hospital or exclusively pumping from the start, getting those early sessions in sets the foundation for long-term production.
A common mistake is trying to compensate for missed sessions by pumping longer in one sitting. A 40-minute marathon session once or twice a day won’t produce as much total milk as six to eight shorter sessions spread throughout the day. Your breasts make milk continuously, and removing it frequently keeps the cycle going.
When to Pump Longer: Power Pumping
If your supply is lower than you’d like, power pumping mimics the cluster feeding pattern of a newborn to signal your body to ramp up production. It takes one hour and follows a specific cycle:
- Pump 20 minutes, then rest 10 minutes
- Pump 10 minutes, then rest 10 minutes
- Pump 10 minutes
Try to schedule this in the morning, when milk production is naturally at its highest. Power pumping replaces one of your regular sessions for the day. You don’t need to do it more than once daily. Most people see results within two to three days, though it can take up to a week of consistent daily sessions.
Signs You’re Pumping Long Enough
Timing by the clock is a starting point, but your body gives you better cues. You’ve pumped long enough when your breasts feel noticeably softer and lighter than when you started, milk flow has slowed to occasional drips or stopped entirely, and you’ve continued for about two minutes past that last drop.
If milk is still flowing steadily at the 20-minute mark, keep going. Some people have slower flow or more let-downs (the reflex that releases milk) that happen later in a session. Cutting the session short while milk is actively flowing leaves milk in the breast, which over time signals your body to produce less.
On the other hand, pumping for 30 or 40 minutes on completely empty breasts won’t increase your supply. It just adds unnecessary wear on your nipples. Once the milk is gone and you’ve pumped a couple of extra minutes, you’re done.
Adjusting for Your Flange Size
If sessions consistently take longer than 25 to 30 minutes or you never feel fully empty, the issue might not be timing at all. A poorly fitting flange (the funnel-shaped piece that sits over your nipple) can restrict milk flow and make pumping less efficient. Your nipple should move freely in the tunnel without rubbing against the sides, and you shouldn’t see areola tissue being pulled in. Most pump brands offer multiple flange sizes, and the one that comes in the box is not necessarily the right one for you. Getting the fit right can cut your pumping time and increase output without changing anything else about your routine.