how long will it take this belly dance move to work on belly fat?

http://www.youtube.com/watch?v=d_PmuLjP5uk&feature=related

how long will it take to work? how long should i do it a day?

i also ride horses (english), which is exercise!! so doing this technique and riding everyday and having a healthy diet, will i lose weight. but most important how long will it take??
 
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