I'm sure we're all tired of things like this, so I just wanted to ask a quick question / make a quick suggestion.
Since time limits are a concern, why don't the bijuu holders put dates besides names when they add someone onto their challenge list? That way there's no question about going over time or whatever.
Is there also a time limit between when someone's added to the list and when they have to fight as well? That might alleviate some issues. I know it's 7 days to post per fight, but is there a time limit to when one starts?
I was hoping that someone would bring this up or I would've done it.
I never had a need to put dates next to my challengers due to me keeping the bickering down to a minim and keeping contact with that individual. I mean, it could work for those that are eager to get their chance at that specific beast and that person could use it to keep track of who is next in line for a shot.
Time limit for the start of a match or adding someone to their list? No, there isn't any sort of universal rules besides that both must agree to the match before it starts. Do you want to impose a time limit for the starting of matches?
I would suggest that jinchuuriki and bijuu holders also start using a
countdown ticker for their matches, cool-down periods and vice-versa. (I might start using this format that you suggested to keep evidence of activity and all that jazz.)