I'm going to a conference next weekend and will need to pump (taking DD is not an option). I usually need to pump for about 30 minutes each session when I pump at work before no more milk is coming out. I'm wondering if I need to pump that long each time when away. I won't be saving the milk (too much hassle), but I don't want to adversely affect my supply by not emptying my breasts completely. It's just that 30 minutes is a long time to sit in the bathroom and pump when not in my room. Any advice?