Every hour, not like it matters. Some 15 year old who just wants to play the game and not do anything towards beta testing and reporting is going to get it anyways.
I don't (F5) Know how many (F5)times (F5) i do it, (F5) but if i (F5) keep (F5) doing it(F5) i think i (F5) may (F5) see it (F5) eventu-(F5)ally.(F5)
Whenever i'm wasting time on the forums I just click the portrait dropdown every so often (10 times a day?) to see if D3 pops up on it.
i stare at my tv in my room every 5 minutes or so ( i have my email refreshing on my tv )
once or twice a day... from a couple of times a day. Sort of discouraging knowing I got invited to other betas and I get to watch a bunch of noobs get the beta before me... if I even get it at all.