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4.5 hours
NO
If they're both on the same date, then they mark a period of 21/2 hours.
From 7:45 AM to 4:00 PM is a total of 8 hours and 15 minutes. To break it down, there are 8 hours from 7:45 AM to 3:45 PM, plus an additional 15 minutes from 3:45 PM to 4:00 PM. Therefore, the total duration is 8 hours and 15 minutes.
2 hours.