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The time duration from 3am to 10am is exactly 7 hours, which equals 420 minutes or 25200 seconds.
3am to 10am spans 7 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 3am (03:00) and 10am (10:00), but you can adjust the date or add seconds for more specific calculations.