According to Wikipedia, Timur Gareyev played 48 opponents with a mask before his eyes and sitting on an exercise bike, resulting in 35 wins, 7 draws, and 6 losses. On the other hand, the record for blindfold xiangqi is only 26 opponents. It seems that it is extremely difficult to improve this record even by one game.
I am wondering what makes the difference in the number of opponents? I do not think it is because xiangqi is more complicated than chess.