20 years. I started it in 1984 & finished it in 2004. In between I worked, moved, had kids, raised kids, etc! I would get the blocks out every now & then & arrange them then put them away. When I finally finished it, it didn't go with any of my decor (I made a bunch of matching things for our bedroom back then) so it is in our camper & I love it! I backed it with flannel & it is so cozy! It is not my best effort- I was using all triangles with 1/2" seams, lots of thing don't match up, but it's mine & I finished it!