I'm not sure about anyone else, but only recently have I been able to do 5-6 days a week of training. Unless your diet, rest, stress levels, and supplementation is dead nuts on you will overtrain. Despite 20 years of doing this and pretty good genetics it's only been the last 6 months. Currently I sit in a chair in the AC all day with damn near nothing to do, no stress (other than my circumstances), I eat 3lbs of chicken per day, 3 cups of brown rice, 8oz turkey sausage, 1/2 cup of oatmeal, 4 scrambled eggs, 1 cup of olive oil, 3-4 TBSP of natural peanut butter along with moderate supplementation.
Very few people can devote that kind of energy and attention to this lifestyle.
Other than extreme circumstances (such as mine at this time) I'd advise only 4 days a week of weights.
I have been able to maintain 230 -235lbs at right around 5%. I'm pretty sickly lean. I also do 30-45 minutes a day of cardio on a stair stepper 5-6 days a week...