How often does the map rotate?
I was just on my other account on Wednesday (3 days ago) and I know it was not the last city.
Why is this important?
Because I have a triumph I would like to complete and since I don’t own the season pass it will lock me out once the mission is over. The other maps do not do that as long as you don’t open the conflux chest.
I could wait until the boss fight and then back out.
This use to not be the case but ever since that update 1 week after the start of season of the splicer if you complete Override the last city you would get locked out even if you didn’t open the conflux chest completing that quest step. The other Override maps do not lock you out as long as you don’t open the conflux chest.