# Availability Table (90%-99.999% Uptime)

Availability (uptime) is calculated as a time a given service was unavailable
over a specified period of time. For example to reach 99.9% availability over a
period of a month, the maximum allowed downtime is 43.2 minutes.

The availability table below shows how much downtime is permitted to achieve a
desired availability level.

| Availability level | Allowed unavailability window |               |              |              |              |              |
| ------------------ | ----------------------------- | ------------- | ------------ | ------------ | ------------ | ------------ |
| (uptime)           | per year                      | per quarter   | per month    | per week     | per day      | per hour     |
| 90%                | 36.5 days                     | 9 days        | 3 days       | 16.8 hours   | 2.4 hours    | 6 minutes    |
| 95%                | 18.25 days                    | 4.5 days      | 1.5 days     | 8.4 hours    | 1.2 hours    | 3 minutes    |
| 99%                | 3.65 days                     | 21.6 hours    | 7.2 hours    | 1.68 hours   | 14.4 minutes | 36 seconds   |
| 99.5%              | 1.83 days                     | 10.8 hours    | 3.6 hours    | 50.4 minutes | 7.20 minutes | 18 seconds   |
| 99.9%              | 8.76 hours                    | 2.16 hours    | 43.2 minutes | 10.1 minutes | 1.44 minutes | 3.6 seconds  |
| 99.95%             | 4.38 hours                    | 1.08 hours    | 21.6 minutes | 5.04 minutes | 43.2 seconds | 1.8 seconds  |
| 99.99%             | 52.6 minutes                  | 12.96 minutes | 4.32 minutes | 60.5 seconds | 8.64 seconds | 0.36 seconds |
| 99.999%            | 5.26 minutes                  | 1.30 minutes  | 25.9 seconds | 6.05 seconds | 0.87 seconds | 0.04 seconds |