I doubt if any of us here have the desire or the spare time to spend hrs in the gym.

I am willing to bet that most spend 1-2 hrs x 3-4 times a week!

Even if you don't have a serious commitment to fitness,you are better off than 90% of the general population.

Try to make your workouts intense,even if they are not as frequent as you wish.

Of course,make sure you are OK'ed by your family doc before you get into any strenuous exercise program!

I don't think "you won't gain at all" as they say.
I think if you overdo the aerobics you won't see[b] as much gain [/b] from your weight training,but IMHO 2-3 miles x 3 days a week is not enough to decrease your testosterone levels significantly.

Excessive aerobics will "eat into your muscle mass".
Levels of testosterone decreases,Growth hormone does not increase, and cortisol levels increase.
Not helpful things for someone who wants to increase their muscular mass.

However,if you are like me,and a lot of other people who just want to keep their fat content down and look reasonably well fit,what you are doing is fine!

If you want to grow,have periods of :

A)intense weight training,[b]increased caloric intake [/b],and shorter times (but more intense) aerobic training(1-2 miles with sprints).....maybe during Fall and Winter!

                  with

B)intense weight training [;)],[b]decreased caloric intake [/b] and, intense or moderate aerobic training........maybe in the Spring/Summer

Yeah,the old "bulk up" and "cutting" phases we've read so much about.[:)]