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The time duration from 4am to 5am is exactly 1 hour, which equals 60 minutes or 3600 seconds.
4am to 5am spans one hour. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 4am (04:00) and 5am (05:00), but you can adjust the date or add seconds for more specific calculations.
