My little girl was born at the end of September and I'm headed back to work at the end of November. I've started pumping both before or after leaving the house without her (SAHDaddy feeds her my milk while I'm gone) and once a day when I'm home the whole time to build up a little freezer stash. What I want to know is, how do you decide how long to pump? Currently I get 2-3 oz in 5-10 minutes of pumping both sides at once. I've read that babies generally need an oz per hour of separation, so if I'm pumping every 2 or 3 hours at work then I would need 2 or 3 oz each time. Basically, I'm wondering if I should pump until I get enough milk and feel comfortable, or if the 15 minute pumping sessions are a necessity even if you get more than enough milk before then?