I didn't really have a stash of food when I went back to work...I think maybe 2 bags. What I pump I then put in bottles the next day. So my freezer stash is really for extras...weekends out or something. I did start pumping after the last feeding at night though the week before I went back but ended up stopping doing that later...
Daughter born July 2008; Daughter born March 2010
Son born August 2011
You don't really need a supply. I pump and give LO what I pump the following day. So on Tuesday, LO eats what I pumped Monday. On Monday, LO eats what I pumped Friday.
Re: Pumping for return to work question
I just wrote a whole blog post that answers most of your questions. Your little one is too cute:)
https://thewilsons714.blogspot.com/2010/07/tips-tricks-for-pumping-mommas.html