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.
Yip, long day, especially when it is your fifth in a row after years of it. As soon as my mortgage hits a certain ( pre determined) level I'm out for fear of dying young.