its not that you cant train 5-6 days a week,,,it is that you know your body very well to be able to train it in 30-40 min 3-4 times a week and achieve better results that other cant achieve in 1 and a half hours 5-6 days a week
it also has a lot to do with depression and health problems drug related and the fact you are busy with photoshoots or making money promoting something and you also gotta give time to family
when you are clean or natural or on your short cycles your anger for training is higher,, as crazy as it sounds,,you wanna go into the gym 5-6 times a week ,,
when you are on long cycles and almost never off and get into gh slin igf mgf and very toxic orals with long duration of synthetic injects and fat burners + very strong ai's all mixed together,,,it takes a toll on you and even if you feel like training sometimes youre just too fuckin tired,,so this is why many pro bodybuilders only train 3-4 times a week and not 5-6,,never the less they achieve a lot more due to the drugs,, there is no question or argue about it
the best thing is to listen to your body,,couple weeks 5 times a week then couple weeks 3-4 times a week,,and sometimes when feeling like shit go even 1-2 times a week