Changing your business hours won't retroactively affect ticket metrics and SLAs. This is because these metrics are determined based on the business hours in place at the time they were assigned, and they remain unchanged even if you modify your business hours later.
For more details, you can refer to the originalZendesk help article.
Ticket metrics and SLAs are assigned based on the business hours that are in effect at the time of their assignment. This means that any changes to business hours will not affect these metrics retroactively. For more information on setting your…
Modifying business hours will impact future ticket metrics and SLAs, as these are assigned based on the business hours in place at the time of their assignment. However, any changes will not affect metrics that have already been assigned. For…