Sports have become increasingly specialized and that includes athletes, well, some sports.
Since everything is about money, yeah, only that money. e.g. we are seeing it with football or Tennis; two examples that things have gotten worse there, but the profits from broadcasting, and advertising rights, are enormous.
Hence, why play only on Wednesdays, Saturday, and Sunday? as it was before, on average.
Players underperform, have injuries, short careers, or end up in Sunday-only leagues. But what happens, you don't accept it, there is a long line of talent wanting your job and then, the millions per season.
Football is the Roman Coliseum, the only league that can always be seen at a good level and I don't know how they do it is the Premier League (LP).
The other elite leagues do not perform at 100%, or sometimes you do not see the football you used to.
In the case of Football, playing 90 minutes on Sunday and returning on Wednesday is not a problem, the problem is that you play immediately on Saturday or Sunday, there are three (Or +) games per week, in short it is something that today's athletes Nowadays they assimilate, but injuries and deterioration if you are not genetically advantaged take their toll on you.
Boxing was the same or still is in a certain way for the lower categories, since in a certain way they are federations, even the amateur categories are financed by the governments, so due to so many candidates because they fight for their place at ranking, federations need to classify his many boxers.
But even the professionals from before who were champions exploited them, fighting many times in a year, at the risk of their physical conditions.
In conclusion, recovery in any sport does not have a maximum standard but a minimum, since athletes are genetically different.
Elite athletes rest while they are training , and increase it, they are machines, their recovery periods require them to remain in good condition.
After all that context, your question is very "open" since you have to differentiate between elite athletes and world champions, a world champion does not have to prove anything, so he defends his title once or twice a year.
Aspirants must be at the pace of the fights that lead them to that title
Then, you mention the UFC, and here you fall into the typical mistake, comparing a sport that has an organizational infrastructure of more than 100 years, that is even an Olympic sport and that is a federated sport in many countries, (boxing).
The UFC started as a show, literally, it gets fighters from here and there, karate fighters, wrestlers and a great etcetera of sports.
A group of contact fighters, they found the money in this "anything goes" when it started.
So, the money to be collected or your aspirations in the case of the UFC, tell you what the rest times are.
So, there are minimum recovery times that vary depending on the sport, but generally if you are elite they are 72 hours or less, (e.g. football, Tennis) and you must consider the maximums, age, injuries and your genetics.
In the case of boxers, especially Mike Tyson, he could fight every "24 hours," of course, he eliminated his opponent in the first round.
His genetic condition, combined with his physical conditions and talent, made him an exceptional athlete in the beginning, which is why they "exploited" him and would exploit him to this day.
Now in the case at hand, sports betting, are things that we should briefly know about some sports, for example tennis, another sport that in my opinion abuses its elite players with the points system.
Anyway, you can sense that Djokovic is another phenomenon, he is now the "old man" but if you review his Matchs at 'Monaco'...:
His first game (32nd) he won easily 6-1 and 6-2, that was on April 9, yesterday he played and won, but, 7-6, 6-3. A "normal" result for the quarterfinals, he plays the semifinal in a few hours... and in a couple of days maybe the final (!?).
So, in this case, for example, analyzing his recovery conditions are important for those who bet, yes, he is the great Djokovic, but the physical recovery times change.
