I cut continuous bias binding (2.5 inches wide) and can make enough binding for a King sized quilt from 28" of fabric (42" wide). I use Shelley Rogers' method (Google her) and it is the most sensible and easiest to follow of the many instructions and tutorials that I've seen. She also has a tutorial on how to join the ends so that it is flat and practically invisible. I can cut and press this binding in about an hour and machine stitch it on my quilt in another hour. Two hours - King sized quilt bound and ready to gift!
http://piraterodgers.com/tutorials/cbt/