I FMQ almost all my tops. Before I begin, I wind 6-8 bobbins. That will last me a couple of hours. Then I will wind 6-8 more. I will use up to 1200 yards of thread on a twin size quilt. It all depends on how heavily you want to quilt. I can FMQ all day with no problems, but I can't quilt a straight line to save my life. Even with a walking foot. I'll keep trying though!