AI patrol - player hides from sight

I am creating a simple ai patrol feature where the guard is patrolling using patrol points and when it sees the player it goes towards it and destroys if reaches player (uses on see pawn and ai moveto). This works okay. What I want to do is put a check in to say that during the chase that if the player hides from the ai view, then I want the ai to stop and wait for 3 seconds and then go back to patrolling. And maybe show a countdown timer on screen for this three seconds.
I am a newbie at blueprint scripting so would appreciate the help.