I'm a full-time working mom, and I've just started dropping pumping at work this week. I don't have any longer-term results yet, but so far so good!
I dropped down to 2 sessions/day a few weeks ago, then 1/day last week, and now I've left the pump at home all week. I plan to keep nursing in the morning, evening, and weekends, which has been working for the 4 days I've tried it so far. It's a bit uncomfortable (last night I had to pump before bed because I was too full). We are using my freezer stash and will add formula (*gasp*) when we are out.
I haven't decided yet, but might go back to pumping once at my lunch break again... or pumping at bedtime... so that she can have one small bottle of fresh breastmilk while at daycare in addition to frozen or formula. I've decided for my own stress-level to relax on the # of oz output. Curious to see how my supply keeps up for the coming months, but the lactation consultant who I've seen said that many moms do combo feed, and that there are still a lot of benefits that babies get from having any breastmilk at all rather than none.
Good luck, will let you know how it's going in a few weeks!