You can fight 4 times a day. However, you can only fight 8 times total throughout those 4 days. You are allowed to allot your fights in any way you want.

Want to do all 8 fights in 2 days? Go ahead. Want to spread them out and do 2 fights a day? You can do that too.

The 5th and Final day is reserved for the skilled few that achieved a perfect record. Only people with 8 wins are eligible and these few enter one last fight to achieve the last 9th win.