I have just finished hand quilting a twin size quilt for my daughter and I used 2 and 1/2 spools of thread to quilt, 150 yards each spool.
There are places where there is no quilting (more than 2 inches) but the fabric is very stable and tightly woven (it is 100% cotton drapery fabric) and I used batting made of cotton/bamboo. The backer is a muslin that was 60 inches wide so there is no seam (!!).
I am really tired of quilting this one.
I know with machine quilting there is a LOT more, but what do you all think about coverage when hand quilting?