Typically, if you run any bracket larger than 16 you have to go with a modified or consolation type of bracket. Otherwise, you will have wrestlers that hit there 6 match limit in a day and then they are forced to forfeit matches. 2-day tournaments don't run into this problem as they can spread the match count over multiple days.
This also allows wrestlers that would normally get knocked out of a tournament after 2 rounds to actually get to compete with other wrestlers that would as well, since they most likely would be in the consolation bracket as well.