I never used to have more than one project at a time, key word being "used" to.
More of late, I've been adding projects faster than I'm finishing them. It seems I have one project for each of the quilting clubs I go to, plus one or two at home.
Hmmm, that makes about 5 projects that are active, and a few in the closet collecting pieces until I have enough to start them too. LOL