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by sciurus 1617 days ago
As someone else said, your math is off. Your point is still reasonable, though.

The uptime.is website is a handy resource for these calculations. For example, http://uptime.is/99.9 says

"SLA level of 99.9 % uptime/availability results in the following periods of allowed downtime/unavailability:

    Daily: 1m 26s
    Weekly: 10m 4s
    Monthly: 43m 49s
    Quarterly: 2h 11m 29s
    Yearly: 8h 45m 56s"