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13 hours. 8 pm to 12 am (midnight) is 4 hours. 12 am (midnight) to 9 am is 9 hours. 4 + 9 = 13 -- 13 hours of sleep (if you fall asleep exactly at 8 pm and awaken exactly at 9 am, have not awoken in your sleep, and have not changed timezones)
1300 hours is the same as 1:00 p.m.To convert : time less than 13 -- just add am.if time is 13 or more, subtract 12 and add pm.Examples :1000 hours is 10 am1500 hours is (15-12) = 3 pm.1220 hours is 12:20 am1630 hours is 4:30 pm.2400 hours is midnight
13 hours 45 minutes
7 pm to 7 am is 12 hours 7 am to 8 am is 1 hours → 7 pm to 8 am is 12 + 1 = 13 hours.
Between midnight on January 13, 1997 and September 14, 2009 is a total of 111048 hours.