That may have been the end of a 12-hour time day but not necessarily a 12-hour duty day
Another possibility is that the F/A had been at the airport and on aircraft for 12 hours but that also does not equate to a 12-hour duty day. The pay rate for F/A's (and pilots) is not from the time they show up at the airport or leave the hotel, it starts when the wheel chocks are removed and the aircraft pushed back (called "blockout time"). They are paid from that moment until the plane blocks back in at its next station. Flight crews do receive per diem for all of the time they are away from their domicile station but that usually equates to less than $2 per hour domestically and a little over that for international flights.
(I think I got my facts straight and presented correctly? Any F/A's out there wish to verify or correct this? Being a "Freight Dog" we don't deal with F/A issues at all!
Freight Dogs Anonymous - O.O.T.S.K.
DAMN! This SUCKS! I just had to go to the next higher age bracket in my profile! :-(