How much cardio are you suppose to do to fight the fat off?

I do 30 min cardio, and 15min strength 6 days a week. Hasn't helped with weight loss at all.

You have to burn more calories than you consume to lose weight. There's no magic number amount of cardio to do, but the normal recommendation for beginners is 30 minutes a day.

Fight that fat!!!!

I think you have to keep the heart rate up for over 30 min for cardio

*I do hour long zumba classes 5-6 days a week (sometimes two of them- like this morning)

It's going to depend on your body and your diet, and the amount will change with age. At 39 I have to do a lot more cardio now to keep the fat off than I did 10-15 years ago!

Weight is lost in the kitchen, not on the treadmill!
Fitness is obtained in a gym/on a treadmill.
It takes A LOT of cardio to make a dent in calories for weight loss. 30 minutes of running will burn between 200-300 calories depending on the intensity and your metabolism. AND if you consume those calories post workout in the form of Gatorade or extra food, you're not at a deficit at all. You need a deficit of 3500calories to burn 1lb of fat.
You biggest weight loss item will be increasing the quantity of food WITHOUT increasing the calories you intake - feel fuller on less. And not through "reduced-fat" or "sugar-free" crap that creates a metabolic nightmare! So, start to shift your diet to CLEAN foods. In general, processed food are more calorie dense, do ditch the processed food and stock up on nutrient dense fruit and veggies, whole grains and homemade whenever you can. Plan ahead and kick that muffin top to the curb!

What does benefit you is 30+ minutes of HIGH intensity cardio - sweating like crazy and consuming much oxygen. Research has shown a direct correlation between oxygen consumed and calories burned - makes sense if you think of metabolism as a fire - it needs oxygen to burn. By exercising so you are consuming much oxygen you are stoking the fire which then has an afterburn effect - a concept known in the fitness world. After an intense workout - you can continue burning calories in proportion to how long and how hard you worked out. This only works for INTENSE workouts, not after a jog or a walk around the block.
ALSO, incorporate resistance/weight training into your fitness routine - blood rich muscles requires more oxygen thus they burn more calories at rest than does fat. So by increasing your muscle to fat ratio, you'll be burning more calories when you're doing nothing at all.

Fitness can be achieved fairly quickly - in just a few months
Weight-loss takes time - months to a year or more if you have much weight to lose
BOTH are needed for good health, so make those 30minutes count - work out HARD, get a day of intense cardio and the next really focus on building strength and do this with intensity as well. Then hit the kitchen and fuel your body with clean, nutrient dense foods.

Weight Lift