(20 + X*2)
Each X cost 2 turns, each X extends the duration by 1 Hour.
(24 Hours + X*1Hour) At a limit of 48X.
Target fleet can have one more ship, if the duration ends the tail ship will be auto taken out from the fleet and is placed in a new fleet called "Extension" and any danger it has from fleet is also in this fleet. (Danger is not transfered, both fleet will have the danger.) Making this fleet a new target not only will this means that its risky for people to do this but also makes people use hideout on the fleet before it leaves the fleet. If the fleet is traveling the new fleet will be traveling towards the port the fleet was traveling at the same speed.
This is longer then it needs to isnt it?