I think this is specific to person, age, other aspects of life e.g. level of stress and sleep quality that affects recovery. If you go to failure but you can tr

I think this is specific to person, age, other aspects of life e.g. level of stress and sleep quality that affects recovery. If you go to failure but you can train that main muscle group on the same week, I think you are fine as ideal set number for intermediate athletes are between 12-20 per muscle group (according to Dr. Mike Israetel @ Juggernaut Method).