Change the default error message "This item is on sale...." to an applicable message in this case. This can be done in Translations -> Customize -> Select language.
Important note: the orders that are eligible for the extended timeframe need to be tagged, either in bulk inside Shopify or automatically using an App like Shopify Flow or Mechanic. This order tag is then used by our Advanced Rules as shown above under 2) and will replace *order tag from the order*.