accessory outlets

[psywzrd]

Does anybody know how long the two accessory outlets in the front dash continue to provide power after you turn the vehicle off, remove the key and lock the doors? I've seen 20 minutes and I've seen until the battery is dead and I'm wondering if anybody has a definitive answer. The reason I'm asking is because I bought a cradle for my ipod that plugs into one of those outlets and I want to know if my battery will go dead if I leave the cradle plugged in overnight or even for a few days. Thanks.