11 yds is a lot for a 60x60" quilt unless you're talking about the backing and binding too. Even then it might be a lot. Oh well, you can always use the leftovers in another quilt or sell them. I never wash a length of fabric over 2 1/2 yds long. It gets too tangled. You can serge both ends to prevent keep if from ravelling or cut it with pinking shears.