We need a maximum of two years. As we know, elections are held every four years, and it takes two years to reach a consensus with elected representatives and officials. It will take another two years for regulations to be put in place.
If there's a change in elected officials following an election, we've at least won a regulation. Consequently, a two-year period seems perfectly reasonable to me. We need a first year to test the mechanisms and a second to implement them a little more formally.