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The deadline is calculated when the notice arrives, not when someone reads it.
Court notices from LexNET, government e-offices or email are read on arrival: the proceeding, the type of decision and the date are identified, and the deadline is calculated in business days, excluding Saturdays, Sundays, public holidays and August where the rules say so.
The deadline appears in the calendar of the lawyer in charge and the team, with staged reminders. A person confirms the calculation before it is accepted; the system never decides on its own when something is due.