Out of curiosity, I had a look at the NZ managed isolation website. There is no place available at all (calendar stops in April). Not a single one. If Canada decides to go this way, this is actually a way to ban (almost) all international travel.
We will see if that actually happens, but I wouldn't be surprised at all if it comes to that. Hopefully it would be just for a couple of days, like you get tested at D+1 and can be released when the result comes back after a couple of days, but if I have to bet I would still put my money on 14 days...
We should know more next week anyway...