Yeah, they will not cut short the third round of the US Open. That just won't happen, it never has. If I remember correctly, the telecast was on until after 1130 PM eastern time in 2008 when they were at Torrey. And even with 'sunset' being at 8:29, you still have probably 30 minutes of light left and still able to see fairly well. You want to push that and you could probably play until 9:15 or 9:30 (I know I've played that late during the summer). I don't see it being an issue, they can finish in 4:30 as two-somes.