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Availability Percentage

A year has 365 days. That is 8760 hours or 525600 minutes.
One percent of 525600 minutes is 5256 minutes or 87 hours and 36 minutes.
So, if an environment is available 99%, it is unavailable for a little more than 3 and a half days in a year.
If it is available 99.9%, it is down for approximately 9 hours in a year.
Or 52 minutes if it is available 99.99%.
Or a little more than 5 minutes if it is available 99.999%.