I wanted just to make a small bowl, especially since my "stripe" was going both ways after cutting the bias strips. I heard other students saying they had run through two bobbins and it still wasn't as big as they wanted. So I zipped along, using up only one bobbin and the base used up almost all my stripes just going one way. So, to get some walls on my bowl I had to use the other way stripes.
Apparently it turned out big enough to store my honey's golf balls!