others couldn't have said it better
Your answer would be very product and cable design dependent. What gauge (AWG) is the cable, what insulation does it have etc.
The main manufacturers Commscope, Panduit, Siemon, Leviton etc will have product specific data on their Cat6 and Cat6A products online (NEXT, FEXT, AXT etc).
BTW Cat6 is an industry standard that dictates a maximum distance of 100m for 1GBASET. If you exceed 100m you're not compliant to Cat6 and you're just using a Cat6 cable for your specific purpose.
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