If you bought the retail box all I can say is GOOD LUCK trying to play on launch day... or launch week even.

I bought the Early Access, downloaded the client (13.5 gigs) and then 2 days later they brought the patcher up and we get ~800MB of patches. (??!)
Download speed was terrible for me... 20-30kb/sec, I let it ran overnight and still wasn't done this morning.

Who knows how big of a patch the retail box client will need on launch day...