When planning your bankroll management it is important to understand, that variance in tournaments is directly related to the field size. If you play very large MTTs with say 10.000 players, an average player is only going to win 1 out of 10.000 and final table in less than 1 out of 1.000. This mean, that downswing can last a very long time and become extremely large, so if this is the only tournament, you play, you need at least 1.000 buyins to decrease the risk of going bust.
DONs however are the exact opposite. An average player will cash in 1 out of 2, and each cash is equally large. So for this kind of tournament 20 buyins, which you started with, is completely reasonable, and there is no need to increase it, as you move up. You are already well bankrolled for 2$ DONs but should consider moving down again somewhere between 20$ and 40$ depending on, how sensitive you are to swings and losses.
Your sample of 116 is enough to say with almost 100% certainty, that you are a winning player, which is a further reason to not keep hanging on at the very lowest limit any longer. Your hourly winrate will almost certainly be higher, if you start moving up now.
https://www.primedope.com/tournament-variance-calculator/
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