"Never exercise for over 45 minutes"

[wild_wild_wes]

I would be more worried about the prolonged effects of elevated cortisol levels due to stress. Increased basal levels of cortisol would mean you are constantly exposed to its catabolic effects. Unless you are swimming the English channel, stress is more likely to burn your muscle than a workout.

That is what the studies I outlined in the OP said: elevated Cortisol levels for long periods causing excess catabolism.