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What 99% uptime means

Many Hosting providers guarantee 99% or 95% uptime. How much is that?

If it’s up…   It’s down… per year
90%   876 hours
95%   438 hours
99%   87 hours, 36 minutes
99.9%   8 hours, 45 minutes, 36 seconds
99.99%   52 minutes, 33.6 seconds
99.999%   5 minutes, 15.36 seconds
99.9999%   31.68 seconds

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