In the past, how long have Up-to-date OS upgrades taken to arrive? I've bought a Macbook Pro Retina display before Mountain Lion was released. I have signed up for a copy of Mountain Lion for free, as promised by Apple if you purchase an Apple computer after June 11, 2012. When I finished the application form, the page said to wait till I get an email from Apple.

The problem is I don't know how long to wait. If past is prologue, how long is it before I can expect to get Mountain Lion? It has been three hours, and I still have not received an email.
This appears to be a real issue, per this MacRumors article from earlier today:


  Apple support staff have acknowledged the difficulties and are advising customers that they may need to wait up to three days to receive replacement codes, although some replacement codes are reportedly already coming through without any action required by the users.


Hopefully your codes will arrive within that window - if not, I recommend you contact Apple support; given proof-of-purchase on your MacBook, they should get you sorted.