Availability Table

Summary

The availability of a service is measured by how long it is unavailable over time. A table shows the allowed downtime for different availability levels, ranging from 90% to 99.999%. For services with partial availability, it's better to use an aggregate unavailability metric instead of just outage lengths.

Highlights

Availability level Allowed unavailability window
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 ([View Highlight] (https://read.readwise.io/read/01j3y5rdykd36exyw23b3wra45))