2 week old going 6.5 hrs + between feedings?

Woodsie

DS cluster fed from about 11am-3pm today and was fussy/gassy the whole time. I finally got him to sleep at 4:30 and he is still sleeping (it's 9:45 here)! The longest he's ever gone before has been 5hrs between feedings and that was in the middle of the night.

Should I count my blessings and let him sleep or should I be concerned about him not waking to feed? He's been eating really well and gaining weight well above the average rate.