I need help to set the delay time of actor`s stop network synchronization when IsNetRelevantFor() return false

[cloodshop]

With Engine Default Set,if a actor call function IsNetRelevantFor() to get if it is relevant for player or not. If IsNetRelevantFor() is return true ,the actor open its synchronization at once. But if IsNetRelevantFor() is return false ,the actor will delay 5 seconds , after 5 seconds ,the actor close its synchronization.
So if I need the actor close it`s synchronization at once, how to do?