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Delivery estimates chain two working-day periods: handling before dispatch and transit afterwards. An order placed 11 May 2026 with one day handling and four days transit ships on the 12th and arrives on the 18th - seven calendar days including the intervening weekend, which is what the customer actually experiences.
Ship date
ship = order date + handling working days
Delivery
delivery = ship date + transit working days
Because most services do not operate a full weekend schedule. A Friday dispatch with two day transit arrives Tuesday, not Sunday.
Yes. Combining them hides the fact that an order placed late on Friday does not begin handling until Monday.