100m is apparently the max distance, but the closer the better really.
60m is quite long.
It shouldn't make a huge difference to your speeds.
Not quite sure I would agree with that, I agree with ronski where it depends on the overall line length.
if the line is short enough it will make potentially zero affect to speeds, whilst if the line is long enough it can make a large effect (10s of mbits) as at certain distance points the tail off is more rapid.
It also will likely increase the impact of crosstalk as every tie pair between the cabinets on a full cabinet is carrying vdsl signal, vs in a typical pair bundle many will be voice/adsl only and no source of crosstalk. The longer that distance between the two cabinets, the more chance of crosstalk.
With that said tho, its probably not worth fussing over as in the grand scheme of things this will be a massive improvement over legacy ADSL services.