Oh wow...for myself, it was probably when I was in college. So, umm, 1994 or so.
How long do you spend at your hairdresser/barber's when you go??? (I ask b/c today we spent 3 hours there, but it was me and my mom both getting highlights AND haircuts, plus I got my eyebrows waxed, LOL)
That I can remember...36 hours, I think. I was so tired that I actually fell asleep sitting up in the Captain's chair in the back of the ambulance while running lights and sirens to a call.