The solution is 3 or 4 FT's and TT's per map. If the hangers are dropped at one, then the action can move to the next and so on, till 3 hours later everyones back where they started, kind of like musical chairs.
HT could code in a trigger when fighting becomes impossible for one side - my humble suggestion would be the Benny Hill chase theme instead of the air raid siren, which goes off at the bishrooknit bases and lets everyone know it's time to move on.