The Prof.'s time between rankings were highly variable. I've seen people promoted every year for a few years in a row and others lag. I largely agree with what bloodwood has said however.
To the question of tournaments--that was never a part of Modern Arnis since I started in the mid-80s. Frankly, I felt that the Prof. actively discouraged us from such competition. He emphasized having fun training together, not competition.
Others may have had a different experience than me, and other FMAs may be different. In the WMAA sparring is now mandatory for the black belt test (padded sticks). But that was my experience.
To the question of tournaments--that was never a part of Modern Arnis since I started in the mid-80s. Frankly, I felt that the Prof. actively discouraged us from such competition. He emphasized having fun training together, not competition.
Others may have had a different experience than me, and other FMAs may be different. In the WMAA sparring is now mandatory for the black belt test (padded sticks). But that was my experience.