Five nines, commonly taken to mean “99.999%”, may refer to: • High availability of services, when the downtime is less than 5.26 minutes per year Availability % Downtime per year Downtime per month Downtime per day 90% (“one nine”) 36.5 days 72 hours 2.4 hours 99% (“two nines”) 3.65 days 7.20 hours 14.4 minutes 99.9% (“three nines”) 8.76 hours 43.8 minutes 1.44 minutes 99.99% (“four nines”) 52.6 minutes 4.38 minutes 8.64 seconds 99.999% (“five nines”) 5.26 minutes 25.9 seconds 864 milliseconds 99.9999% (“six nines”) 31.6 seconds 2.59 seconds 86.4 milliseconds 99.99999% (“seven 9s”) 3.16 seconds 262 milliseconds 8.64 milliseconds 99.999999% (“eight 9s”) 316 milliseconds 26.2 milliseconds 0.864 milliseconds 99.9999999% (“nine … Continue reading Wikipedia