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11am to 12 is 1 hour 12 to 5pm is 5 hours → 11am to 5pm is 1 + 5 = 6 hours
12 hours
7am to 7pm is 12 hours 7pm to 11pm is 4 hours Add 12 and 4 and you will have the answer
nine and a half 11 to 12 = 1 hour 12 to 9 = 9 hours 1 + 9 = 10 10 - 30 minutes = 9.5 hours 9 hours 30 minutes unless it is say 11am to 9am next day then 21.5 hours
0.95 + 12*k where k is any integer.