I think the body mostly takes about two weeks to adjust. Most folks I've talked to have stories about sitting around for that amount of time "completely fucked" while doing everything they could to stay comfortable. My favorite so far has been the military chick who, and I'm totally quoting here, when transferred to the swamp "wrapped [her] legs around the chilled propane tank and put iced cans of bud between [her] bosoms while sitting underneath a fan for half [her] cycle and still drenched the floor with more sweat than that wap song." Which, really, puts all my complaints of the cold in perspective.