cardio question

Hey everyone,
I recently got a treadmill and am trying to aim for one to one and a half hours on it several times a week. I know that it's best to do cardio for 45-60 minutes at a time for weight loss, but due to my endurance and other issues I was hoping to do it for thirty minutes, two to three times a day.

If I do this will it completely get in the way of potential fat loss? If I do, say, half hour morning, half hour later on, maybe another half? Would that be completely pointless for someone trying to lose weight (to break up my cardio workouts into two or three smaller sections all throughout the day)? I don't know how much that will rev up my metabolism. I just was looking to see if anyone knew whether or not that was a bad idea. Thanks!

I would get into this slowly at first.

Start by doing 10 to 15 minutes a day for a week or two and then add 1 or 2 minutes a week. If you try to do too much too fast you will end up quiting entirely.