Recently I went to Colonial Williamsburg in Virginia and visited with the weavers. Outside their building was a warping board to embarrass all other warping boards. It was about 6.5 feet tall and at least 8 feet wide. You could make a warp chain 85 yards long on it. You would be exhausted afterwards though! You would have to step up on a stool to reach the top and it was a few strides from one side to the other. They told me that weavers of the time routinely created warps which were over 80 yards long. Hard to imagine, isn't it?
My guess is that if you were “in the business” of weaving coverlets - you’d want to put on a long warp ……. however, 85 yards for floor loom just boggles my mind!