probably between 250 and 500 for queen size quilts...some LOTS more, some maybe less...this year i've been doing great, using my stash and not buying other than batting, so this years quilts have been much less expensive...bad news is though, i've about run out of decent size pieces, and tired of my stash...almost time to start buying again :)
i am almost done piecing a queen size flannel quilt for my sister, all out of scraps, and it is turning out great...will post pics soon!