How do holidays affect the delivery estimate? (Pro)

Holiday handling is a Pro feature:

• Create a global holiday calendar once and reuse it across rules.
• Add fixed dates (e.g. 2026-12-25) or recurring closures (e.g. every December 25).
• Each rule can add its own rule-specific closures on top of the shared calendar.
• Calendars support CSV import and export for bulk editing.

Dates inside a closure period are treated like non-working days, so processing and transit days do not count against them.