Colin Phillips (Alumni)
Many thanks to this URL for the details: http://royal.pingdom.com/royalfiles/pingdom_uptime_cheat_sheet.pdf
| Uptime (percent) | Downtime per month | Downtime per year |
| 100% | 0m | 0m |
| 99.999% | 0.4m | 5m |
| 99.99% | 4m | 52m |
| 99.9% | 43m | 8h 46m |
| 99.8% | 1h 26m | 17h 31m |
| 99.7% | 2h 10m | 1d 2h 17m |
| 99.6% | 2h 53m | 1d 11h 2m |
| 99.5% | 3h 36m | 1d 19h 48m |
| 99.4% | 4h 19m | 2d 4h 34m |
| 99.3% | 5h 2m | 2d 13h 19m |
| 99.2% | 5h 46m | 2d 22h 5m |
| 99.1% | 6h 29m | 3d 6h 50m |
| 99.0% | 7h 12m | 3d 15h 36m |
| 98.9% | 7h 55m | 4d 0h 22m |
| 98.8% | 8h 38m | 4d 9h 7m |
| 98.7% | 9h 22m | 4d 17h 53m |
| 98.6% | 10h 5m | 5d 2h 38m |
| 98.5% | 10h 48m | 5d 11h 24m |
| 98.4% | 11h 31m | 5d 20h 10m |
| 98.3% | 12h 14m | 6d 4h 55m |
| 98.2% | 12h 58m | 6d 13h 41m |
| 98.1% | 13h 41m | 6d 22h 26m |
| 98.0% | 14h 24m | 7d 7h 12m |
| 97.9% | 15h 7m | 7d 15h 58m |
| 97.8% | 15h 50m | 8d 0h 43m |
| 97.7% | 16h 34m | 8d 9h 29m |
| 97.6% | 17h 17m | 8d 18h 14m |
| 97.5% | 18h 0m | 9d 3h 0m |
| 97.4% | 18h 43m | 9d 11h 46m |
| 97.3% | 19h 26m | 9d 20h 31m |
| 97.2% | 20h 10m | 10d 5h 17m |
| 97.1% | 20h 53m | 10d 14h 2m |
| 97.0% | 21h 36m | 10d 22h 48m |
| 96.9% | 22h 19m | 11d 7h 34m |
| 96.8% | 23h 2m | 11d 16h 19m |
| 96.7% | 23h 46m | 12d 1h 5m |
| 96.6% | 1d 0h 29m | 12d 9h 50m |
| 96.5% | 1d 1h 12m | 12d 18h 36m |
| 96.4% | 1d 1h 55m | 13d 3h 22m |
| 96.3% | 1d 2h 38m | 13d 12h 7m |
| 96.2% | 1d 3h 22m | 13d 20h 53m |
| 96.1% | 1d 4h 5m | 14d 5h 38m |
| 96.0% | 1d 4h 48m | 14d 14h 24m |
| 95.9% | 1d 5h 31m | 14d 23h 10m |
| 95.8% | 1d 6h 14m | 15d 7h 55m |
| 95.7% | 1d 6h 58m | 15d 16h 41m |
| 95.6% | 1d 7h 41m | 16d 1h 26m |
| 95.5% | 1d 8h 24m | 16d 10h 12m |
| 95.4% | 1d 9h 7m | 16d 18h 58m |
| 95.3% | 1d 9h 50m | 17d 3h 43m |
| 95.2% | 1d 10h 34m | 17d 12h 29m |
| 95.1% | 1d 11h 17m | 17d 21h 14m |
| 95.0% | 1d 12h 0m | 18d 6h 0m |
In the table above, a month is 30 days and a year is 365 days.