The Charter sets the conditions.Because you believe everyone deserves the right to be afforded a decent legal defense.
Great example.
What's the criteria for a protest to become an occupation? Who decides when that legally protected activity is no longer protected?
This article explains it more than I can.
Setting up feed stations, fuel dumps and other services with an intent on not leaving would seem to be some of those criteria. Preventing locals from their rights is also a limit.
Occupy Ottawa lasted 30 days. But they were smart and set up a camp in a park and left residents alone. But still got evicted a lot later than they should have.