I think Americans expect a response all the time, at dinner, at the gym, at midnight etc... I once had a work colleague email me at 9 and then called at 9:15 to follow up and ask if I had a chance to review the email... WTF? It was not even time sensitive. It's crazy. I can't be bothered to work so hard, the more I make, the more taxes i have to pay. If I didn't have it so easy, i wouldn't bother.