In the case of payment in advance, the period for delivery shall commence on the day after the payment order is issued to the remitting bank or, in the case of other forms of payment, on the day after the conclusion of the contract and shall end with the expiry of the last day of the period. If the last day of the period falls on a Saturday, Sunday or a general holiday recognised by the state at the place of delivery, the next working day shall take the place of such day.