Depart-node-delay
From FreeSpace Wiki
depart-node-delay
Returns true N seconds after the listed ships depart, if those ships depart within the radius of the given jump node.
The delay value is given in seconds.
Takes 3 or more arguments:
1: Delay in seconds after the last ship listed departed before this expression can return true.
2: Name of a jump node
3+: List of ships to check for departure within radius of the jump node