I have no experience of team handling. Recently, a junior staff member was hired to work under me. He has been good in his work. Recently, he has started focusing more on office extracurricular activities. For example, we have an indoor sports tournament and he is a leader of one of the teams. So he is spending more time on that tournament. When he comes to the office in the morning first thing he does involves tournament related arrangement; his actual billable work starts 1 or 2 hours later. He spends his entire lunch break on these extracurricular activities.
The tournament starts in the evening, so he closes his work before it starts. Hence, even though he is inside the office for 9 hours, his actual billable hours are around 5 hours. The company expects 8 billable hours per day.
What is the best way to handle this employee so that he understands that he needs to work 8 billable hours in addition to any time he has spent on extracurricular activities?
Since I'm not involved in those extracurricular, it should not create an impression that I'm restricting him out of my own disinterest in those activities.
PS: I work in India with an American organization, so it pretty much follows the American work culture.