Normally it doesn't take me six hours to install a zipper. The longest on record for me is two hours to correct sloppy stitching, but this dang zipper took me hours. Since this zipper sits on the fabric as part of the decorative design, I had to conceal the raw edges of the zipper first before installing. This task shouldn't have been so utterly grueling, but today it was for me. I did this same procedure the other day in less than a half hour. Well, at least the sewing of the zipper onto the bulky material was a breeze- all thanks to my Singer 201, bless her soul.