Has-undocked-delay
From FreeSpace Wiki
Has undocked delay (Boolean operator) Becomes true <delay> seconds after the specified ships have undocked the specified number of times. Returns a boolean value; Takes 4 arguments: 1: The name of the docker ship 2: The name of the dockee ship 3: The number of times they have to have undocked 4: Time delay in seconds (see above).
Comments
Use this if you want a transport to depart as soon has it has undocked from its target. Don't confuse this SEXP with its direct counterpart, has-docked-delay, or weird events may occur ingame.