// how much downtime is

99.5% uptime = 43.8 h down per year.

That's 2.3 nines. Allowed downtime at 99.5% availability:

per year43.8 h
per month3.7 h
per week50.5 min
per day7.2 min

The neighborhood

what one more nine buys you
90%36.5 days/yr
99%3.7 days/yr
99.5% ← you are here43.8 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.