I work full time (well, for 4 more days) and I've never had an issue with multiple dogs.
Then again, all of their ages are staggered so I've never had 6 dogs who didn't know basic obedience at one time. My oldest is almost 9 and my youngest just turned 4.
My dogs are all "pets only," although I do trick training and fun things with them. I'd like to do agility with Emma and Zara once I'm home full time and in a routine as a stay at home mom.
I'm not sure I'd ever have 6 dogs again (I think 4 or 5 will be my future max), but I've never complained or felt overwhelmed with my volume of dogs. All of mine are little, though... even Rory (35lbs) is small in comparison to most!