Unverified50% confidenceFactExact time
99.9% availability corresponds to approximately 8.7 hours of downtime per year, and 99.99% corresponds to approximately 52 minutes.
1
Sources
50%
Confidence
Long-term
Relevance
10/1/2026
First Seen
Sources
Related Entities
Related Claims
Verified99.999% availability means no more than 5.26 minutes of downtime per year.75% similarUnverifiedIf both the upstream vendor and the aggregator have an availability of 99.9%, the end-to-end availability is approximately 99.8%, equivalent to an additional roughly 43 minutes of downtime per month.75% similarVerifiedSLA availability is typically measured in N nines: 99.9% means approximately 43 minutes of allowable downtime per month, while 99.99% means approximately 4.3 minutes.75% similarUnverified对于911这类关键基础设施，系统可用性通常要求达到五个九（99.999%），即年度计划外停机时间不超过5分15秒73% similar
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