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You're asking about "how long", with something that has "in a week" already in the question - you might want to rethink that.

Anyway, trying to lose 20 lbs in a week is unhealthy, very, very difficult and very unlikely to either succeed or give a lasting result.

Aim for losing 1-3 lbs/week instead, which is fairly easy on a sensible diet. You'll reach your goal in a couple of months anyhow, with a much greater chance of both success and a sustainable result.

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11y ago

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