I'd keep on and do all 12. Just think, in 12 weeks you could have a beautiful quilt. Some of my applique blocks take a week or more to complete, and others have said they worked on yo-yo quilts for YEARS. The first two blocks are georgeous and I encourage you to keep on keeping on. Even if you have to take a break and just do one a month. Lots of BOMs take that long. Do it!! You'll be glad you did.