Any amount I can afford depending on the fabric and the price. If it's to be used as a focus fabric usually 2 or 3 yds, a backing at least 6, to add to my stash 1 yd. If it's clearanced and really reduced and I like it a lot I'll get whatever is on the bolt. Sometimes if I'm wanting to use it for backing, borders and sashing I just get the whole bolt if the price is right. I have two sisters that quilt and I share a lot with them.