Our school requires grades to be in within 30 days of the last final exam. Only one of my grades is still out (there's a way to tell through our website, even though they haven't released the grades yet.) and its legal methods, which was turned in April 12th. I think they take so long so as to screw up those who want to transfer. Friggin ridiculous.
My school requires this as well, though the profs regularly break that rule.