It really varies. Work is the main factor for me - I work more than 40 hours a week sometimes; it tends to go in spurts. If I'm tired or stressed I don't work on quilts because I end up making mistakes and becoming MORE stressed. So when work is hectic I don't sew at all on work days and little on weekends. When work is light I sew more, and when I'm on vacation I sew practically non-stop!
This year...I don't think I've finished any quilts this year yet. Lots of stuff in progress and a couple nearly done though, I can't work on just one thing at a time. Last year I probably finished about a dozen quilts. Year before was a busy one, I think I did 23 quilts that year. I'll probably finish at least 10 quilts this year. I have lists, somewhere... LOL