I like a long drop. I want it to at least cover the mattress then go about 2-3 inches over the boxspring which is covered by a bedskirt. I like them long because I don't want to fuss with it getting exact in the center. If one end is longer then it's fine. I also only like the drop on 3 sides. The top is for the pillows. Though I do often make matching pillow shams.