What's up bro's, learning much and just thought i'd share what i've read on this post. Even if the longest recovering muscle group takes 96 hours, it shouldn't matter since you should make sure to give a full 7 days rest in between workouts of a specific muscle group. A big misconception with weight training is that as you progress you add more and more exercises and sets. This is not true. There are certain ranges of sets that effectively and efficiently stimulate the muscle. Exceeding this range can actually impede your progress. In this case, more is not better. As you get more advanced you will increase your weights but your volume of total sets will stay virtua
ly unchanged.
This is just what I read and what I follow bro, I hope it helps. You might be doin to much therefore hurting something and needing longer to recover. I'm not sure though, either way I hope this helps a little and that you fully recover. Thanks for reading.