Hey jhinako!

And congrats on your weight loss!
Twice a day every day sounds like a bit much. I'd say, try once a day for 30 minutes to start--that should be plenty. And rest every third day. You don't want to overexert and burn out on it. On the days you're not using the gazelle, you could just take a walk instead. Walking is good exercise.
I don't know how much or how soon, when it comes to pounds. You'd have to give more information about how many calories you are eating now, if you're counting calories. Or show a sample daily menu.
I'm going to move your thread to the Exercise! Forum where you might get more response. You'll see a link in Weight Loss Support for about a week, so it won't get lost in the shuffle.
Jay