How long does it take to replace a dim radio in 2006 BMW 325i?

The lights in the right side of my radio are dim....how long will it take to for the BMW service center to repair it? Like 1 day? 2 days?How long does it take to replace a dim radio in 2006 BMW 325i?They won't repair it, they will put a new one in your car. If it's on the shelf, it will take them about an hour.

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