How much weight will I lose by daily workout for 1 hour?

Anonymous
I am 5’4”
I gained weight to 120 lbs
My perfect body is 105 lbs and I want to go back to it.

I started going to gym 4 days ago and I’ve been working out daily ever since on average for min. 40 minutes (not counting breaks) max 1.5 hour (not counting breaks)

I get 1100-1200 calories daily.

How long will it take me to get to 105 lbs?
Updates
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How much weight will I lose by daily workout for 1 hour?
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