// how much downtime is

90% uptime = 36.5 days down per year.

That's 1.0 nines. Allowed downtime at 90% availability:

per year36.5 days
per month3.0 days
per week16.8 h
per day2.4 h

The neighborhood

what one more nine buys you
90% ← you are here36.5 days/yr
99%3.7 days/yr
99.5%43.8 h/yr
99.9%8.8 h/yr
99.95%4.4 h/yr
99.99%52.6 min/yr
99.995%26.3 min/yr
99.999%5.3 min/yr

Azure services live at specific rungs of this ladder — see the SLA dataset, or compute the composite for your whole environment from one Resource Graph query.

ⓘ Designed availability, not a guarantee.