99.999% Uptime is difficult to achieve and may not be worth the cost.
From the table below, your website would be unreachable for only 5 minutes a year if you are to be called 5 nines or 99.999% available.
| Uptime (%) | Downtime |
|---|---|
| 90% | 876 hours (36.5 days) |
| 95% | 438 hours (18.25 days) |
| 99% | 87.6 hours (3.65 days) |
| 99.9% | 8.76 hours |
| 99.99% | 52.56 minutes |
| 99.999% | 5.256 minutes |
| 99.9999% | 31.536 seconds |