I'm pretty sure that such a cable would violate the standards. You could instead get two mini-B to A cables and a USB A coupler to go in the middle (couplers also make a mockery of the standards, but seem to be popular anyway).
Depends on the cable. With poorer quality ones you should only expect 2-3m for reliable data transfer. If you're going much over that a booster is recommended. High quality cables can do 5m, but they're expensive.
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