In my tests on both machines, the actual installation took about two hours, but a full workday or more was spent tweaking each machine, and getting updates to Windows 8 and its built-in apps.
Football games last about three hours -- longer than the actual flight -- and still passengers were willing to pay to watch a game they knew they wouldn't catch the end of.
In the brief span from 1980 to 1985, actual teaching loads across the country were reduced from 10.2 hours to 8.4 hours per week, a 17% drop in teaching productivity.