It probably depends to some extent on the size of the crochet thread used. Finer thread works up more slowly than thicker thread. I don't think anyone could pay me enough to make a 55 x 72" tablecloth out of crochet thread! But that's me.......
Edit: I know it's possible to purchase inexpensive hand crocheted tablecloths from China. Overstock sometimes carries them, and Etsy and eBay have some. Here is a vintage hand crocheted tablecloth I found on eBay for about $40 in the size you mentioned:
http://www.ebay.com/itm/Vintage-Hand...cAAOSw241Yi-Ig