Turn an uptime percentage into allowed downtime, convert downtime back to uptime, or find exactly when a support ticket is due under a business-hours SLA. Free, no sign-up.
Uses a 365.25-day year, so a month is 30.44 days and a quarter is 91.31 days on average.
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Common uptime targets and a response-time SLA that runs over a weekend.
A standard 99.9% uptime commitment.
Uptime target 99.9%.
0.1% of the time can be down: 1m 26s a day, 43m 50s a month, or 8h 46m a year.
A premium tier promising 99.99%.
Uptime target 99.99%.
Only 4m 23s of downtime a month, or 52m 36s a year. One slow deploy can use the whole monthly budget.
An incident took the service down for 45 minutes this month.
45 minutes of downtime per month.
1 - 2,700 / 2,629,800 seconds gives 99.897% uptime for the month. That misses a 99.9% SLA.
A 4 business hour first response target, Monday to Friday, 9:00 to 17:00.
Ticket received Friday at 15:00.
Two business hours run out Friday at 17:00. The clock pauses for the weekend and the last two hours run Monday 9:00 to 11:00, so the reply is due Monday at 11:00.
The math is simple. The definitions around it are where most SLA disputes start.
99% allows about 7 hours 18 minutes a month, 99.9% about 44 minutes, 99.99% about 4 minutes. Cost and effort rise sharply with each nine.
A monthly SLA resets every month, a yearly one lets a bad month be offset. State the period, and whether planned maintenance counts, in the agreement.
"4 hours" means very different things at 16:00 on a Friday. Spell out your business hours, days and timezone, and how holidays are handled.
Most support SLAs promise a first reply time. Resolution time depends on the problem and is harder to guarantee, so it usually gets a separate, looser target.
Bund AI replies to customers on web chat and email in seconds, any hour of the day, from your own help content. It resolves routine questions itself and hands the rest to your team with the full context, so the first response never waits for business hours.