Like any workout or dance program, results will vary from one person to the next. It takes two to three weeks to start seeing results from Zumba class if your goal is weight loss. A one-hour Zumba class will help you burn between 400 and 500 calories. Consistently going to Zumba class can help you achieve health and weight loss goals. If your goal is better physical fitness, you will start noticing improvements in your strength and stamina within the first month of attending Zumba class.