R-6.01, r. 4.1 - Rules of Procedure of the Régie de l’énergie

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56. If the expiry of a time period determined in these Rules for the doing of a thing falls on a non-working day, the thing may be validly done on the next following working day.
For the purposes of the first paragraph, Saturday, Sunday and any other day on which the offices of the Régie are closed are non-working days.
O.C. 1098-2014, s. 56.