How much should I be on the treadmill?

FallingInReverse
Every time I lift or am at the gym pretty much, I run at least 2 miles. I'm considered "ripped" by friends and family even tho I don't see it, but I want to be bigger too. I'm all toned, I just want to start building up muscle mass. A fellow body builder saw I was on the treadmill a lot and told me I should run less because too much cardio kills lots of your gains. And yes, I do lift (1.5 hrs of lifting at least) but should I cut back on the running?
Cut back
No you don't have to
Other
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How much should I be on the treadmill?
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