Delayed entry after inbounds pass...

[OrStBballRef]

Boys JV2 game last night. 2Q home team is in-bounding the ball on the baseline. I notice the player (H24) in-bounding the ball is taking a long time to come back onto the court after he throws the ball in. In this particular play before I can say or do anything ball is knocked out on the far side of the key and I'm now in-bounding the ball from the other side of the key.

Same player in-bounds the ball and throws it in to a player right by the 3 point line near the sideline. The ball is then passed FT extended and is about ready to come into the post and I open up my position to view the post play. I notice H24 still hasn't come back in yet. He's making no attempt to enter the play he's still standing OOB.

Ball comes into the post play (in my primary) and H24 is still OOB. The player guarding the in-bounds pass is still guarding H24 and can't move to cover the post play close by as he's still watching/guarding the OOB player. He eventually makes a move to come in but moves directly towards the post player/action and just barely gets his toes over the line and remains OOB. I figured this was about 3-5 seconds based on my internal clock and external counts with no attempt on his part to get back in....he wasn't caught in a bunch of players and trying to move around to get back in etc...he just didn't move or make an attempt to come back in the court.

So I issued a T for purposely delaying return to the court. I believe this is the first time I've issued a T for this... Home team coach wasn't happy 'We've run that play for 9 years etc...you should have warned him/me etc...'

Questions I have are:
1) For those of you who have called this do you have a set amount of time in your head before you make this call? Or is it a strictly HTBT situation?
2) Would you warn the player/coach first to get back in bounds immediately after the pass?