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How many hours between 4:00 AM and 10:00 PM?

Answer: 18 hours

We convert both times into minutes from the start of the day, subtract, and if the result is negative we treat the end time as the next day (midnight crossing).

Readable form: 4:00 AM → 10:00 PM = 18 hours

Quick Answer

How long is 4:00 AM to 10:00 PM?

These expressions all describe the same result:

Hours between 4:00 AM and 10:00 PM = 18 hours
4:00 AM to 10:00 PM = 18 hours
Time difference from 4:00 AM to 10:00 PM is 18 hours

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Detailed Math (Step-by-Step)

Full minute-based operation shown clearly.

Step 1: Convert both times to minutes

Start time 4:00 AM
Start in minutes 240 minutes from 00:00
End time 10:00 PM
End in minutes 1320 minutes from 00:00
Minute formula: difference_minutes = end_minutes − start_minutes

Step 2: Subtract (and handle midnight crossing)

Raw subtraction 1320 − 240 = 1080
Difference (minutes) 1080 minutes
Convert to hours 1080 ÷ 60 = 18 hours
Readable form: 18 hours
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Examples table

Common hour differences.

Start End Difference Notes
9:00 AM 5:00 PM 8 hours Same day
8:00 AM 12:00 PM 4 hours Same day
11:00 PM 2:00 AM 3 hours Crosses midnight
10:15 AM 6:45 PM 8.5 hours
8 hours + 30 minutes
Same day
7:30 PM 1:00 AM 5.5 hours
5 hours + 30 minutes
Crosses midnight

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Accepted formats: 9am, 9:30am, 10:05pm, 12am, 12pm

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