Does buying World of Warcraft: Burning Crusade add more game time to your account?

I've had the plain old vanilla version of WoW for quite some time now, and my subscription is coming to an end. I want to get Burning Crusade sometime this weekend, yet I also need a game card to add more time. Will I have to buy both a game card and Burning Crusade, or will BC come with another free month of game time like the plain version of WoW? It'd be a lot less strenuous on my paycheck.