I always know which role I'm going to get in ranked games

When I select mid primary and support as my secondary, I can always tell which role I will get depending on how long it takes to find a game. This is useful for me because if I want to play my main role (mid) really badly, and the queue pops in 45 seconds (approx.), I don't accept it since it's giving me the support role. Then, I re-queue and it often will take 3-5 mins meaning I got the mid role.

Maybe this will help someone else too