Below is(part of) what I found on page 1......
You need to play at least 500 ranked rounds as Legend to saturated ( average stops going up ) before reaching Tour Legend.
When it is equal or smaller than 60 you go from Legend to Tour Legend.
You need to play at least 200 ranked rounds as Tour Legend to saturate ( average stops going up ).
When it is equal or smaller than 60 you go from Tour Legend to Champion.
You need to play an additional 200 ranked rounds as Tour Legend before reaching Champion.
You need to play another 200 ranked rounds as a Champion to saturate ( average stops going up ).
So I can tell you that it was 100% NOT 200 ranked round to saturate at TL it was around 750 (for me anyway) or way over 500 as I gave up keeping track around 580....
I am not worried so much about reaching Tour Champ as my average is at a long way from the required 55.00 at a lackluster 58....
THAT BEING SAID I SURE WOULD LIKE TO KNOW WHEN I WILL SATURATE AT CHAMPION JUST SO THE ANNOYING AVERAGE FLUX WILL STOP!!!.....
I again gave up counting ranked rounds but can tell you I am well over DOUBLE the 200 "Ranked Rounds" that is in above post and it I have still NOT saturated??
Does anyone have an answer thanks.........JD