i feel your frustration, but in truth at least the updates are less often than Microsofts. i hate it when i need some info my machine is running like the hard drive is made of syrup, then wants to restart. last time i had over 50 updates and took over an hour to sort itself out ;(.
Not sure why you have this problem so regularly, only to sayApple servers will be far more busy when pumping these updates out, given the enormous user base, all i can say is both my ip4s and my ipad2 took Around 15 minutes each to instal 6.01, but may have downloaded it in the background overnight.
you say you have a fast connection but have actually you run 'speedtest' to see if your getting near for what you pay for? i'm on BTInfinity allegedly 'superfast' broadband, i pay for 40 megs but feel lucky to get 20 megs.