I've made a couple of quilts with this technique. It took me about 12 hours because I don't have a serger. So first I stitched the seams with a regular straight stitch and then I had to go back over them with a zigzag to flatten them out. If you don't do this, it will get really bulky since the seams have 4 layers of fabric and 2 layers of batting and the seams are 1/2" instead of 1/4"