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The hour (common symbol: h or hr, h being the international form of the symbol) is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 second ..more definition+
In relation to the base unit of [time] => (seconds), 1 Hours (hr) is equal to 3600 seconds, while 1 Milliseconds (ms) = 0.001 seconds.| 21 Hours | to common time units |
|---|---|
| 21 hr | = 75600 seconds (s) |
| 21 hr | = 1260 minutes (min) |
| 21 hr | = 21 hours (hr) |
| 21 hr | = 0.875 days (day) |
| 21 hr | = 0.125 weeks (wk) |
| 21 hr | = 0.0023972602739726 years (yr) |
| 21 hr | = 0.028767123287671 months (mo) |
| 21 hr | = 0.00023969562460368 decades (dec) |
| 21 hr | = 2.3969562460368E-5 centuries (cent) |
| 21 hr | = 2.3969562460368E-6 millenniums (mill) |