I work on however many quilts I feel like working on at any given time. Right now, I am piecing two projects and quilting two projects- 3 of these will be completed within the next month or so. The 4th will probably take longer as it is an improv. piece and I only work on it when I've got my design wall freed up. Right now, I also have about 20 UFOs. My UFOs always get finished eventually. They become UFOs because I get tired of working on them, or because I've hit a design or technical snag and need to let them sit until a solution presents itself to me- at which point, they get finished. Over the years I've had as many as 40 UFOs and as few as 10. I like variety, so I enjoy being able to work on multiple things at once.
Rob