I used to do just one at a time. Then I started doing two at a time. Now I do LOTS at the same time. I have a ping pong table to work on and I have four "stations" set up for my four "main" projects. Other projects cut in line sometimes though. Love the variety. I never get tired of working on any one thing, and it helps to let things sit so that I look at them a lot. Sometimes I change my mind about a fabric, for example. And if I'm anxious to finish something, I do!