https://flightlight.com/app/uploads/...yle-A-RevC.pdf
Thats the reference I found the fastest.
Your answer is on page 7.
It’s not just distance by the way, it’s angle and distance.
At 10 miles and 3000’ AGL you’re on a three degree angle and should see two white two red. At the same 3000’ AGL but 20 miles you’ll see 4 red.
Looking for a runway VFR at night you’ll generally pick up the 4 red before you’ll see the approach lighting system.