pretty simple question, just wondering when the cardio becomes too much and your body just goes into shock/storage mode? I see a lot of people at the gym (guys and gals) who have been there as long as I have and they really haven't toned up much in a couple years and all they do is come into the gym, get on the machines and do the same routine everyday, 4-6 days a week.

I really dont want to do any extra work that I dont need to. I know everyone is different, but what is a good balance of weekly cardio sessions for steady fat loss goals?

Right now I am doing 10-20 mins before my workout (4 times/wk) and then sometimes adding another 10 mins or so at the end of the workout. Ive been adding in a 5th day just for cardio where I do 40-50 mins with a target of burning an extra 7-800 cals.

I know we can get into calories burned vs calories consumed for fat loss, but Im more concerned as to when is too much. How much rest should a person have per week? 1 day off, 2?

thanks guys