According to this link, the number of players that advance to the next round in a daily tournament (round-robin knock-out format) is the group size divided by two, rounded down.
https://support.chess.com/article/119-how-do-i-create-a-tournament
Chess.com - How do groups work?
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So, when you have tournaments with high percentage of people per group qualify, how do later rounds with less than that number per group work? Imagine, if you will, a 25 person tournament with 5 in a group and 3 qualify as an example (this example used as it fits the structure of a tournement I'm in currently). Assuming no ties:
R1: 25 people, 5 groups of 5
R2: 15 people, 3 groups of 5
R3: 9 people, 1 group of 4, 1 of 5
R4: 6 people, I'd naively expect two groups of three - but then everyone would be guaranteed to qualify and you're stuck with an endless loop. Does it switch to a 6 person group at some point for the final? Or does someone (who?) get a bye in their own group to avoid the infinite loop? Or does it switch to the top 1 qualify near the end?