Joke. 12 hours with an aluminium tube strapped to your backside and no room to stretch your leg, all starting at 05.30 on day 5. Good game.
RAT, (European) regulator shares your view. Assuming your/worst conditions - reduced 45 minutes reporting time, 30 min turnaround - the maximum "strapped to aluminium" period is 10:45 with crew check-in at 0530L. Long day nevertheless.