Training more a week would depend on your cumulative stress from te rest of your life. An Olympic lifter just lifts, recovers an lifts again. It's their life and they put a lot of their life into recovering from their sessions.
A typical office worker would work say a 38 hour week, come home to the kids and wife, have house chores to do etc so their stress levels would be higher and training more would probably lead to overtraining much sooner than on others. If you have the mind set and dedication you probably wouldn't be the above typical office worker and would be focussing hard on recovery and be able to train more.
It would also depend on how you train aswell but this is just my generalized answer. I know a guy who competes in strongman events, trains like an animal, runs his own business, works another odd job on the side, has a wife and kid and still saw massive strength and size gains last year. He to me would be the definition of an overtrainer but he seems to pull it off because he is dedicated and has the right mindset. I guess it's all down to managing your own stress levels, keeping up your recovery and training smart.
I really agree with Fadi it's all about recovery and managing your life properly.
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