i will be returning to work very soon and am wondering how long i should pump. i used to pump for 15 minutes. but my lo only nurses for 4-5 minutes at a time and i'm wondering if that's a sufficient time to pump for. i don't think he empties my breast. i don't want to pump for too long and build up my suppy because i'm looking to wean at 1 year. he's 8 months old now and eats once breast per side. he also eats solids 2-3 x a day.