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If your cab is upgraded, and the distance you quote is the distance that the line follows, then you're likely to be able to get around 80/20 speeds. It'll depend on the thickness of the copper as much as the distance, which is harder to find out.
At 350-400m, on 0.5mm copper, I could just get speeds of 80/20. In early days, I could have achieved much more than this, perhaps over 90Mbps, but as take-up increased, the attainable speeds are known to degrade through crosstalk - after 2 years we got 78/20.
Whatever you do get initially, expect that it can and will drop as take-up increases.
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