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Quick Answer
How long is 7:00 PM to 7:00 AM?
These expressions all describe the same result:
Hours between 7:00 PM and 7:00 AM = 12 hours
7:00 PM to 7:00 AM = 12 hours
Time difference from 7:00 PM to 7:00 AM is 12 hours
Detailed Math (Step-by-Step)
Full minute-based operation shown clearly.
Step 1: Convert both times to minutes
| Start time | 7:00 PM |
|---|---|
| Start in minutes | 1140 minutes from 00:00 |
| End time | 7:00 AM |
| End in minutes | 420 minutes from 00:00 |
Minute formula: difference_minutes = end_minutes − start_minutes
Step 2: Subtract (and handle midnight crossing)
| Raw subtraction | 420 − 1140 = -720 |
|---|---|
| Midnight crossing | Add 1440 minutes (24×60): -720 + 1440 = 720 |
| Difference (minutes) | 720 minutes |
| Convert to hours | 720 ÷ 60 = 12 hours |
Readable form: 12 hours
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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