Please answer,how long will this take?

If I cut down to 1200 healthy calories a day and go power walking 4 nights a week for over 2 miles, how long will it take me to lose 2.5 stone? And will 10 months be long Enough? I'm 15, 5'4(height) and almost 10 stone, ideally I want to be 7.5 stone, how long will it take by doing this??
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