I just finished hand quilting a vintage DWR double bed size quilt top. It took about 180 hours,but I also told myself that it's a utility,not a show quilt and did 6 stitches per inch. I also quilted a GMFG. With 1 1/2 hexies..around both sides of each seam..double bed size....it took over 500 hours. The time it takes is dependent on how many stitches per inch,and whether or not it's an elaborate design. I go faster if I machine baste with water soluble thread and don't put it in a hoop. I would choose a straight line grid pattern..and a good- sized one! Good luck!