I have kept track of some quilts cause I do both long arm quilting and make t-shirt quilts. T-shirt quilts will take about 30 hrs (-/+5 hrs) from the designing to the sewing down binding on the back by hand. Think that sounds high, but I do usually end up cutting 3 times--initial just to get t-shirt apart, then to get the rough cut so I can stablize, then the trim for piecing. I have also kept track of time on how long it takes to do some custom quilting on a few quilts and found that it truly does justify my custom charge! One for daughter that took lots of marking was 30 hrs for a queen size; another for a large lap size, but dense, modern quilting, took about the same.