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8am to 4pm Is How Many Hours?

Hours and minutes between two clock times — overnight included — plus adding or subtracting hh:mm durations.

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Calculating the duration
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Result

An 8am to 4pm shift spans exactly 8 hours. This page opens the duration calculator with 08:00 and 16:00 preloaded — the early-start counterpart of the 9-to-5, common in manufacturing, construction, schools, and clinics.

Eight clock hours rarely mean eight paid hours: subtract a 30-minute lunch and the 8-to-4 day is 7.5 worked hours; subtract a full hour and it is 7. Enter your break in minutes and the calculator shows the net duration in hh:mm alongside decimal hours and total minutes.

Need a different shift? Change either time — the tool handles any pair of clock times, even spans that cross midnight, and a second mode adds or subtracts hh:mm durations directly.

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Accepted Formats & Rules

  • Time between two clock times with optional break
  • Add or subtract two hh:mm durations
  • Results in hh:mm, decimal hours, and minutes

Key Benefits

✓ Overnight spans are detected automatically when the end time is earlier than the start.
✓ Every result comes in hh:mm, decimal hours, and total minutes at once.
✓ A second mode adds or subtracts two hh:mm durations without base-60 mistakes.

Use Cases

  • • Find out exactly how long a shift lasts: pick the start and end times, subtract the lunch break, and read the result in hh:mm and decimal hours.
  • • Calculate an overnight span like 9pm to 5am — the calculator adds 24 hours automatically when the end time is earlier than the start.
  • • Add two hh:mm durations, such as timesheet entries or flight legs, with minutes carried correctly instead of decimal guesswork.