Originally Posted by Eric

Did he miss work? Is he hurting someone? Is he not doing chores?

If no to all of the above, I would leave him alone. If yes, then have a talk with him about responsibility. If it was his free time and that was how he chose to use it, I don't see a problem with it. Maybe use this as an opportunity to get closer with him. Ask him what he did while playing for all that time. Sure it may not interest you, but it interests him, even if he says, "You would never understand Dad." Say, "maybe not, but would still be cool to hear what you did."

Make it an opportunity to reach out to your son, not an opportunity to ridicule his decision and make him feel like an outcast.