Rough figures, and I'm long retired, so bear with me. Short-haul in Europe. Four sectors @ 2hr each = 8 hr. Add 1 hr report, 3 x 40 min turnround (not you-know-who) plus 30 min post-flight = 11.5 hour day. Early start used to be 9 hr max. 47 weeks @ 5 days per week = 235 working days. If half are earlies, the figure comes to 2402 hours per year, the equivalent for a "wage-slave" who only gets two weeks leave a year, a 48 hour week