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It means: 1 hour and 45 minutes
45 full days would be 1080 hours. 45 days times 24 hours in a day equals 1080 hours.
1 hour = 60 minutes, so 45 minutes = 45/60 hour ⇒ 7 hours 45 minutes = 7 + 45/60 hours = 7 + 3x15/4x15 hours = 7 + (3 ÷ 4) hours = 7.75 hours
(20 hours 30 minutes) - (5 hours 45 minutes) = 14 hours 45 minutes.
45 seconds is 0.0125 hours.