How about "You're joking, right????" Then if they say that they are not joking, you say "Do you know what goes in to making a quilt?" Then, tell them. yada, yada, yada........ Problem solved. I think it is incredibly nervy for someone to ask you to give up your time when they have just as much time as you do. (mabe that makes me a Stinkweed, I don't know)