Just guesstimating, 10 wall quilts which is what I make when I'm testing a technique. (sold all the rest at a recent garage sale)
15 - 20 queen quilts. My early quilts are all wore out and sent to the great quilt rest home in the sky.
Quilting has been my passion since 1970. For the past 20 years all my bed quilts have been double sided.
Saves a ton of space and if I send them out it cuts the quilting cost in half
so that estimate of 15-20 could be doubled if you count both sides.
I know passionate quilters who have store bought made in China quilts on their beds, it just makes me sad.
I want my quilts used to death!
and I don't make quick quilts, mine are made from intricate patterns with many small pieces. If I were in a hurry I'd buy a blanket.