During the final bout of the fourth round of the Devata Realms' Battle of the Geniuses, there were 100 participants who could be challenged. 75 out of the 100 participants were those who qualified in the second bout like Duan Ling Tian. The remaining 25 out of the 100 participants were those who advanced during the third bout.
The participants who were eliminated during the previous bouts in the fourth round would be given ten chances to issue challenges. Based on this, there would be roughly 1,000 matches if no one surrendered or if everyone used all their ten chances.
Needless to say, not everyone would use up all ten chances. Those who were truly powerful would usually be able to secure a place to advance to the next round after one or two challenges. Only those who were weak would usually use up all ten chances.