Its limited to one per account. On the bright side, you could give the second copy to a friend and get him/her into the game too, hehe. I believe the "Refer a Friend" program allows a new player to activate a full account using a boxed edition of the game, so you could net yourself some more free time as well. You can access that program via your PlayNC Master Account.
Or start two accounts... If dual boxing interests you.
Get a family member into the game.
(I still wish I could get my sister to stick with it more than a couple of days at a time. 
)
So my birthday was today and my friends got me a copy of the architect edition
But they gave me two copies is it possible for me to add the codes in for the two and get the two boosters or is it limited to one of the product to my account?
Thanks in advance!