It’s typically 4 yards, 2 for each side. That will yield a blanket that is about 4x5’ in size.
I'm sorry, you'll have to ask the experts at Joann's.
It would depend on the final size that you're looking for it's best to call the store to make sure you're getting the proper amount and I would go with a little bit extra that way if you need more you have it on hand.
At least 2.5 yards
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