My workouts

So for anyone who knows me, knows that I spend alot of time in the gym...probably to the point of overtraining. Don't mean to but I like being there (the sights are great!) and its also an escape for me. I make a habit of doing ALOT of cardio. So recently I stopped all that and try very hard to limit my cardio sessions to 30 minutes....especially if I know I will back that day. So how much cardio is too much? And what is the magic number of exercises and sets I should be doing for my workouts....I am currently hitting one body part a day. I am focusing mostly on my upper body at this point cause my legs are pretty much dialed in although I never pass up suggestions. Oh and on my cardio I like to change it up every couple of days and have even done a couple or so machine for shorter times to equal 30 minutes.