There is a limit of 65,535 bytes in the "About You" section of your userinfo page. In most cases, 1 character is equivelant to 1 byte-- with the exception of some UTF-8 characters.
and possibly also mention:
Also, I obviously am fickle on wether to use "field", "area", or "section".
update: rho pointed out this entry, which is related to this entry, from a few months ago. It was never decided upon, it seems.