I am a pretty fast knitter, so I have the potential to finish things very fast. That is, if I didn't have to re-knit about half of what I do! I get going and I forget to check the pattern, or I miss a mistake made early on, and end up ripping out what I've done. Sometimes this happens several times in one part of a pattern even! The baby sweater I'm working on has had the sleeve half knit twice already, it's taken until the third attempt to get it right. First time, not enough stitches picked up, the second time I forgot the decreases. I could be into the second sleeve by now if I'd been more careful, it's frustrating as this happens on most of my projects. I wonder how much ripping others have to do compared to me.........?