If my life were less busy? Two. (Schaffer's not mine, so he doesn't count. lol)
But currently, I'm gone for over fourteen hours most days for school/drama/CAS hours. I'll start incorporating Kailey in my volunteer work this coming summer, but I'm honestly struggling to find enough time for her right now. And I tend to prefer one-on-one time as opposed to huge pack outings, so I definitely couldn't handle two or more right now.
Once I'm out of school, I think three or four would be ideal, though, with their ages staggered. One retired bed warmer, one or two currently competing, and a spazz in training.