Washcloth size?

[Midnightstar]

What is a good washcloth size?
I crochet and i am crocheting a stack of washcloths and i am wondering what's a good size that isn't to large for a basic washcloth? Iv'e tried 20 in length but i still feel it's a little to big in the end. The yarn i use if often bulky and sometimes i use thin yarn so when responding take into account both yarns thanks for the help if you do respond!