Your SLA Clock Should Tick in Business Hours, Not Calendar Hours

A support SLA that promises a "4-hour response" sounds concrete until a ticket lands at 5pm on a Friday before a public holiday. Does the clock run over the weekend? Overnight? Through the holiday? If the SLA doesn't say, you'll find out during the argument — which is the worst time.

Calendar hours punish the wrong people

Measuring SLAs in raw calendar hours means a ticket opened Friday evening is already breached by Monday morning, even though no one was scheduled to work. That's not a service failure; it's a measurement failure. It also incentivizes weekend staffing you may never have promised.

Business hours align the promise with reality

A business-hours SLA only counts time inside your defined working window — say 9am to 5pm, Monday to Friday, excluding holidays. The same 4-hour target now means "within four working hours," which is what both sides actually intended.

Priority tiers multiply the complexity

Most real SLAs stack multiple clocks: P1 might be 1 business hour to first response and 4 to resolution, while P3 is 8 and 40. Tracking those by hand across weekends and holidays is where breaches slip through unnoticed.

The SLA Response / Resolution Deadline calculator takes a ticket's open time, your working calendar, and the target, and returns the exact deadline timestamp — so you're measuring against the promise you actually made.