Coming from the guy that says to do cardio right after you say to lift weights for an hour and a half, I'll take it with a grain of salt. Go to a weight lifting forum and see if you should do cardio while bulking. The only reason they will say to do it will be to keep your heart healthy (and you can do that when you are cutting). I try not to lift weights for any longer than 45-60 minutes, after that you aren't focusing all that well, and are probably pretty spent. Lift HARD, and while your head is in it so you can constantly focus on your form.