You might think about trying Sylvia's Bridal Sampler quilt. It's a similar idea but the blocks are six inches instead of four. As several others have mentioned, there's not rule that says there is a time limit to complete it. Also, if you make some of the blocks by hand instead of machine, you have a great take along project.

It's on my "to do" list as a someday.....What pushed me over the edge was the one that greenfairy quilted....in whites and brights. It was the first color pathway that really called to me. It's amazing how the coloration can make or break it for me.