According to Cisco, the maximum cable length for STP is the same as UTP - 100' or about 330'. This is not to say that cables longer than this won't work. I personally have done very little with STP, but I'm sure I have pulled some UTP farther than 100m.
twisted pair is twisted pair whether it be UTP or STP... it's still got a practical limit of 100 meters. Distance limitations on twisted pair has to do with attenuation and signal strength.
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