I was back at work for the first time today, I'd never expressed huge amounts before but I'd never really tried. I don't think I would get a lot of milk after bub had had a feed, but expressing at work when he would have been feeding (roughly every 4 hours - so I expressed twice today) I got ~100 ml per breast. So that's ~400 ml for the day. It took me about 10-15 minutes per session.
Things that help me are having a picture of bub to look at, having a worn piece of his clothing to smell and imagining the milk starting to flow. I also find that if I don't concentrate on the milk too much, but do something else like read emails etc. that it makes the milk flow better. I'm using a dual pump (Ameda Purely Yours), which I've heard can help you get more milk as well.
I've heard that warm compresses and massage can also help - it's all about getting the letdown reflex happening and making sure to re-trigger it several times within the expressing session.
For about a month before I went back to work I would express a small amount (~30 mls) once a day after a feed to store for my first day back at work. This was recommended at an ABA course I went to and worked well for me.
Really, as long as you'll be able to express once or twice a day once you're back at work you will be fine. You need some in store as back up, but you'll be expressing everyday to replace what is used everyday. Don't stress about trying to have litres and litres in the freezer. My daughter, and others I know of, actually found she preferred to only have a tiny bit during the day and save up for some really good feeds early morning/straight after work. She adjusted her feeding pattern rather than take EBM.
This is what I'm finding so far too!
ETA: I should add that I've always had a good supply (sometimes too good!) and have found expressing easy with my current electric pump. However, previously I used a manual hand pump and could hardly get anything out - even when my breasts were very engorged I could still only get about 10-20 mls. So maybe try a different pump - although I've heard the Medela Swing is good
Edited by Susil, 12 January 2011 - 07:06 PM.