That depends on what on the clock means. My spouse used to work for an airline and they had various clocks. * 1000hour flight time clock which they couldn't ex

That depends on what on the clock means. My spouse used to work for an airline and they had various clocks. * 1000hour flight time clock which they couldn't exceed (cosmic radiation or something). * They had the flight clock which is how they were compensated ie. 14 hour LHR-HKG. * They had the break clock in flight. So crew could sleep 1-2 hours during a 12-18 hour flight. * Rapid response standby (15 minute) was a 12 hour standby shift in the terminal. Because the work times are so extreme cabin crew is given certain latitude in off time. Like, they may work 3 12-hour shifts and then take 3-4 days off. Everything I've read so far has not been clear about why the crew needed to be there on a flight that was already closed (when the last seat is filled the gate is closed). There were many better options, including driving, that were available. Unloading a passenger is a logistical nightmare and most ground crew are reluctant to do it. It messes up their performance metrics but in an airline like United maybe they just don't care.