A FLT ATTENDANT REPORTS A SCHEDULE CHANGE AFTER ARRIVAL AT THEIR RON DESTINATION REQUIRED AN IMMEDIATE DEPARTURE AND A TOTAL DUTY DAY OF 13+22 HOURS WITH NO BREAK.

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WE WERE SCHEDULED TO WORK FLT XX FROM ZZZ TO ZZZ1 THEN LAYOVER FOR OVER 28 HOURS. WE WERE DRAFTED TO WORK FLT XY DIRECTLY BACK FROM ZZZ1 TO ZZZ2 AS SOON AS WE WERE ABLE TO DEPLANE OUR PAX. WE HAD ABSOLUTELY NO REST BREAK AT ANY TIME DURING THE 11 HOURS 12 MINUTES OF ACTUAL FLT TIME OR THE 13 HOURS 22 MINUTES OF DUTY TIME AS WE IMMEDIATELY BEGAN BOARDING THE NEW FLT. OUR TOTAL FLT TIME FOR THAT DUTY DAY WENT FROM SCHEDULED 606 TO 1112. ALL THREE OF US WERE UNPREPARED TO WORK SO LONG. WE HAD NOT TAKEN NAPS OR SLEPT IN LATE. IF WE HAD AN EMER SITUATION WE WOULD NOT HAVE BEEN AT OUT BEST. I BELIEVE IT WAS AN UNSAFE SITUATION AND ONE THAT COULD HAVE BEEN PREVENTED.SUPPLEMENTAL INFO FROM ACN 763301: NOT HAVING PLANNED FOR THIS KIND OF 'TURN' (GETTING PROPER REST BEFORE A TRIP AND ALSO EXPECTING TO GO ON A LAYOVER) RESULTED IN EXHAUSTION AND NOT FEELING THAT I WOULD BE ABLE TO EXECUTE MY SAFETY RESPONSIBILITIES CLEAR HEADED IF NECESSARY. WITH THE HOURS INVOLVED HERE AND OVER 11 HOURS OF FLT TIME WITHOUT A MOMENT'S REST SEEMED TO SURPASS SAFETY AT ALL COSTS.CALLBACK CONVERSATION WITH RPTR ACN 763300 REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT THE SECOND FLT TO WHICH SHE WAS ASSIGNED HAD DIVERTED EARLIER AND WHEN IT FINALLY REACHED ITS DESTINATION 3 OF THE 5 FLT ATTENDANTS WERE ILLEGAL TO PROCEED ON THE RETURN FLT. SINCE THE REPORTER'S CREW WAS LEGAL THE ACR ORDERED 3 OF THEM TO JOIN THE OTHER CREW ON ITS TRIP. THE REPORTER WAS NOT PREPARED FOR SUCH A LONG DUTY DAY: DID NOT REST PRIOR TO CHECK IN; WAS NOT GIVEN A REST PERIOD ON THE FIRST FLT; AND WOULD NOT BE GIVEN A REST ON THE NEXT FLT. BOTH ACFT IN THIS EVENT WERE FULL B757-200'S.