HA

Availability % Downtime per year Downtime per quarter Downtime per month Downtime per week Downtime per day (24 hours) 90% (“one nine”) 36.53 days 9.13 days 73.05 hours 16.80 hours 2.40 hours 95% (“one nine five”) 18.26 days 4.56 days 36.53 hours 8.40 hours 1.20 hours 97% (“one nine seven”) 10.96 days 2.74 days 21.92 hours 5.04 hours 43.20 minutes 98% (“one nine eight”) 7.31 days 43.86 hours 14.61 hours 3.36 hours 28.80 minutes 99% (“two nines”) 3.65 days 21.9 hours 7.31 hours 1.68 hours 14.40 minutes 99.5% (“two nines five”) 1.83 days 10.98 hours 3.65 hours 50.40 minutes 7.20 minutes 99.8% (“two nines eight”) 17.53 hours 4.38 hours 87.66 minutes 20.16 minutes 2.88 minutes 99.9% (“three nines”) 8.77 hours 2.19 hours 43.83 minutes 10.08 minutes 1.44 minutes 99.95% (“three nines five”) 4.38 hours 65.7 minutes 21.92 minutes 5.04 minutes 43.20 seconds 99.99% (“four nines”) 52.60 minutes 13.15 minutes 4.38 minutes 1.01 minutes 8.64 seconds 99.995% (“four nines five”) 26.30 minutes 6.57 minutes 2.19 minutes 30.24 seconds 4.32 seconds 99.999% (“five nines”) 5.26 minutes 1.31 minutes 26.30 seconds 6.05 seconds 864.00 milliseconds 99.9999% (“six nines”) 31.56 seconds 7.89 seconds 2.63 seconds 604.80 milliseconds 86.40 milliseconds 99.99999% (“seven nines”) 3.16 seconds 0.79 seconds 262.98 milliseconds 60.48 milliseconds 8.64 milliseconds 99.999999% (“eight nines”) 315.58 milliseconds 78.89 milliseconds 26.30 milliseconds 6.05 milliseconds 864.00 microseconds 99.9999999% (“nine nines”) 31.56 milliseconds 7.89 milliseconds 2.63 milliseconds 604.80 microseconds 86.40 microseconds 99.99999999% (“ten nines”) 3.16 milliseconds 788.40 microseconds 262.80 microseconds 60.48 microseconds 8.64 microseconds 99.999999999% (“eleven nines”) 315.58 microseconds 78.84 microseconds 26.28 microseconds 6.05 microseconds 864.00 nanoseconds 99.9999999999% (“twelve nines”) 31.56 microseconds 7.88 microseconds 2.63 microseconds 604.81 nanoseconds 86.40 nanoseconds References High availability - Wikipedia