| Availability % | Downtime % | Downtime per Year |
| 98% | 2% | 7.3 days |
| 99% | 1% | 3.65 days |
| 99.8% | 0.2% | 17 hours, 30 minutes |
| 99.9% | 0.1% | 8 hours, 45 minutes |
| 99.99% | 0.01% | 52.5 minutes |
| 99.999% | 0.001% | 5.25 minutes |
| 99.9999% (Six 9 s) | 0.0001% | 31.5 seconds |