High School baseball usually starts at 3pm, sometimes 3:30. He said it's a JV game, and that the opposition (West Hills) might kick their ***. So, since they have a 10-run rule, it could be over by 4pm. Otheriwse, since it is JV, it could also drag ***. I'd say they get done probably between 4:30-5pm.
His "extras" (you know, the players dumb enough to be associated with this) probably have to drag the infield and clean up the dugout first, so add another 15-20 minutes. Then uncleal will probably wait until the coaches leave (lest any sane adult ruin our fun). I'd estimate filming commences approximately 5:15-5:30pm.