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Quick Answer
How long is 9:00 AM to 6:00 AM?
These expressions all describe the same result:
Hours between 9:00 AM and 6:00 AM = 21 hours
9:00 AM to 6:00 AM = 21 hours
Time difference from 9:00 AM to 6:00 AM is 21 hours
Detailed Math (Step-by-Step)
Full minute-based operation shown clearly.
Step 1: Convert both times to minutes
| Start time | 9:00 AM |
|---|---|
| Start in minutes | 540 minutes from 00:00 |
| End time | 6:00 AM |
| End in minutes | 360 minutes from 00:00 |
Minute formula: difference_minutes = end_minutes − start_minutes
Step 2: Subtract (and handle midnight crossing)
| Raw subtraction | 360 − 540 = -180 |
|---|---|
| Midnight crossing | Add 1440 minutes (24×60): -180 + 1440 = 1260 |
| Difference (minutes) | 1260 minutes |
| Convert to hours | 1260 ÷ 60 = 21 hours |
Readable form: 21 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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Accepted formats: 9am, 9:30am, 10:05pm, 12am, 12pm