Only in the specified business hours, escalation notifications are sent to agents.
This is true for the first day - but all consecutive notifications regarding escalated tickets or tickets with pending reminder will always be triggered around 02:00 am each day. I would expect them to be sent 24 hours after the originally specified date/time. Or at the beginning of the next business hour timespan.
Consecutive escalation notifications completely ignore any defined calendar or business hours. They just trigger everyday at 02:00 am and send emails to agents during the weekend…