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The projectionist was on duty for all four screening. For how long was she on duty?
Film length 129min
Screening times 12:45 15:40 18:25 21:00


Odpowiedź :

21:00 + 129min = 23:09

12:45 ---> 23:09  = 10h 24min

She was on duty for 10h 24min.