5 + 12*k where k is any integer.
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6 hours
(11 + 12k) hours where k is an integer.
Six hours in total !
6 pm is also 18 hours, so 18-6.5 = 11.5 hours or 11:30 am.
11:30 to 6 pm is either 6 hours 30 minutes or 18 hours 30 minutes depending if 11:30 is am or pm respectively.