If we go by the last electoral boundary redistribution, which wasn't all that long ago, the exercise should take between 24 and 26 months. That's how long it took the last time. Keep in mind that, back then, 30 ridings were added and, as a result, the commissions asked for time extensions, which were allowed under the act.
Without a fairly detailed scenario, it's hard for me to say whether it would take 22, 24 or 26 months. I would be misleading you if I were to give you an answer.