Uptime percentages (five 9s / nines)
| Name | Outage |
|---|---|
| 5 9's | less than 5 minutes and 15 seconds per year |
| 4 9's | 52.60 minutes |
| 3 9's | 8.77 hours |
| 2 9's | 87.6 hours / 3 days 15.6 hours |
| Uptime | Yearly | Monthly | Daily |
|---|---|---|---|
| 99% | 3.65 days | 7h 18m | 14m 24s |
| 99.9% | 8h 46m | 43m 50s | 1m 26s |
| 99.99% | 52m 36s | 4m 23s | 8.6s |
| 99.999 | 5 min | 26 sec | < 1 sec |
(https://en.wikipedia.org/wiki/High_availability#Percentage_calculation)