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The time duration from 1am to 3am is exactly 2 hours, which equals 120 minutes or 7200 seconds.
1am to 3am spans 2 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 1am (01:00) and 3am (03:00), but you can adjust the date or add seconds for more specific calculations.