How long will it take me to lose 7stone if I eat max 600 cals a day?

The past few days I've been eating

200 cals breakfast

Dinner: 250 cals

lots of water and green tea and fruit.

How long will it take me to lose 7 stone if I keep this up.

How long will it take me to lose 7stone if I eat max 600 cals a day?
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