Fed rules. Nobody one, nobody out. Batter strikes out swinging and ball gets away from the catcher. BR easily beats the throw to first. After running thru the bag, BR returns to first but does not immediately re-touch the bag and is actually standing next to the bag talking to the first base coach. First baseman now with the ball tags the runner and the BU calls him out. I didn't see this happen nor was it a game I was working, I'm hearing this second hand. My question is, what is the "time limit" that a BR has to return back to the bag? Thanks.