4 hours.
9am until noon is 3 hours and 1 more makes 4.
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1300 - 0900 = 0400; 4 hours; forgive me.
16 = 11 + 5 1pm to midnight is 11 hours (12 - 11 = 1) then midnight to 5am is 5 hours
109 hours
9 + 24k hours where k is an integer.
21 hours