When/how often does Frostmourne reset?

[Loadsamoney]

If I were to move from Lordaeron and start new on Frostmourne, how long would I have to play before Frostmourne resets?

Edit: Nevermind, I just found out Icecrown has adjustable rates too. I've been torturing myself on Lordaeron for nothing.

[ZpiXDK]

Every year in Feb.