Running running

is it okay to run for 1 hour 30 minutes to 3 hours on maybe. 3 - 5 days a week and maybe 30 minutes to 1 hour of running on other days. is this okay to do to lose lots of fat. ( not worrying about muscle loss ) . and also throw in a couple of HIIT on the other machines in the gym ( not treadmill ) ( low impact ) for 20 minutes to lose fat loss. all this for fat loss? any good?
 
holy smokes... simmer down

It takes time. Don't freak and burn yourself out. Otherwise, you may not be running in a couple of months. Instead, you will be at the orthopedic's office!

One long run day (1+hour) of running per week is probably plenty for you. The rest of the time you can run upto 1 hour per day. Also, always take a rest day no matter how much running you do.
 
Don't burn yourself out, but what you're doing actually isn't that uncommon. Well, for marathon runners, anyway.

The body only starts to burn fat after 30 minutes of exercise, normally, because it will first go through the phosphagen energy system and the glycolysis energy system (burns carbs) before it switches to the oxidative energy systems (burns fats, and to a lesser extent, proteins). So longer workouts would technically mean more fat burned in this way.

HOWEVER! A long workout like that will also burn muscle protein. I know you say "not worrying about muscle loss" but I wonder why this is. More muscle = more fat loss. The amount of muscle you have often determines the amount of energy your body tries to utilize in the form of fat. Since larger muscles require more energy to support them, they will burn more calories throughout the day and result in more fat loss.
 
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