Building this final model only took a couple of days, but I started the whole "Yuffie papercraft project" about two months ago: ninjatoes.blogspot.com/search/…

So that's quite a long time, but there were quite a few things to do, even though FF7 Yuffie is a relatively "easy" model, and papercraft is only a hobby of mine of course, so I can't work on it all the time. ;o)