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