Does the zumba wii game really work? & if so, how long should it take to lose 70 lbs?

I just recently started going to Planet Fitness, & I want to lose almost 100 lbs. I go 4 days a week for about 2.5 hours. How long should it take to lose this much weight with going to the gym and the zumba workout wii game.

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Recommanded Answer:
EVERYTHING depends on the calories.. You don't even have to work out to lose weight, you just have to stay in a calorie defecit