I'm still trying to increase my milk supply so, I was just wondering how long I should pump for. Should I wait until there is barley anything coming out or is 20-30 minutes enough. I get most of the milk out the first 10-15mins, but pump for 45min hoping more will come out but there isn't much after. I also heard that you produce milk every hour. is that true. would you pump for 15 mins every hour instead. I've also heard of women getting 2 letdowns in 1 pumping session. How long would they be pumping for that.