Hi, we need Zendesk to support stopping SLA countdown on holidays. Some tickets will be breached when there is no one to on duty on holidays, and this affects our performance metric. Is it on your roadmap?
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Stopping SLA countdown on holidays
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in terms of the schedule, yes, you can add Business hours that include holidays:
Here you can also find more details on Defining SLA policies.
Unfortunately, it is not natively possible to clone a schedule.