(6)After receiving a complete notification of impracticability, a resolution authority should have a reasonable timeframe to evaluate it. Notifications can vary in complexity. It is therefore appropriate that a resolution authority is allowed to extend the timeframe for requiring the inclusion of the contractual term for a predetermined period of time as regards complex notifications. Such an extension should be duly notified to the relevant institution or entity. Considering the novel nature of the notification and its assessment, resolution authorities should be allowed to extend the timeframe to assess complex notifications for six additional months during the first year after the entry into force of this Regulation. After this period, resolution authorities should be allowed to extend the timeframe for the assessment of complex notifications for three months.