In a single match there are two sumo wrestlers competing against each other. In a tournament there can be dozens of competitors, in a round robin type format.
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It is very short, the match is over in a few seconds. Sometimes (very rare) a match can last longer, up to 4 minutes.
The number of sumo stables is capped at 105, though they may allow temporary stables under special circumstances. The size of a stable varies.
The official tournaments last 15 days. Each wrestler will compete once each day. The total number of bouts varies.