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10 pm Thursday to 1 pm Monday should be 87 hours: 10 pm Thursday to Midnight (12 am) Friday = 2 hours Friday = 24 hours Saturday = 24 hours Sunday = 24 hours Monday Midnight (12 am) to Noon (12 pm) = 12 hours Monday Noon (12 pm) to 1 pm = 1 hour Total = 87 hours.
There are 12 hours in a day after noon.
Noon to 4:15pm is 4 hours and 15 minutes. Noon to 4:15am is 16 hours and 15 minutes.
There is no such time as 12 am. am stands for "before noon" and before noon cannot be noon.
Technically, 12 AM doesn't exist. We refer to 12 noon or 12 midnight. From 6 AM, it is six hours till noon, and eighteen hours till midnight.