Certainly.
Currently the notice to bargain period is four months. Right now the average period it takes to negotiate a collective agreement is anywhere from 18 months to two years, and sometimes longer. As a consequence, you have in many instances in negotiations, huge periods of retroactivity involved.
The idea in having a longer notice period is so that the parties have sufficient time to negotiate a settlement and reduce the significant numbers of months between the expiration date of the collective agreement and the signing of the new one. That would give currency, which is a benefit for the individual employees as well as the employer and the bargaining agent.