Depends on how quickly you calibrate to your 'true rating'. Elo-like systems take relatively quite long, since you can gain at most k points per game (but obvio

Depends on how quickly you calibrate to your 'true rating'. Elo-like systems take relatively quite long, since you can gain at most k points per game (but obviously fewer points per game if you're being matched with someone who's similar in skill to you). Chess GMs for example stream their 'new account to GM' runs, and it takes very many hours. Chess is a game where there's very high correlation with individual skill and the outcome, in more noisy/random games like Dota 2 for example (which also are ~40 minutes on average) your expected relative gain per match is much lower.