Don't want to argue - but he went from an air-conditioned space ( assumed dry ) to hot exterior, very wet. You'll see a change pretty quickly -
Plus you have to worry about the finish, glue joints, and the tension the strings are placing on many of the components.
In a steam tube, you can change a strip of 1/8 wood from something that will crack if you look at it wrong, to something you can tie an overhand knot in , in alot less than an hour - usually about 15-20 minutes, actually -
http://www.finewoodworking.com/Skill...t.aspx?id=2962
Wood is amazing stuff - and quick, extreme changes in temperature and/or humidity can affect a good guitar very, very quickly - I'm just saying its cheaper to be careful.