http://us.battle.net/d3/en/forum/topic/13271427071

Based on player feedback (and the desire to facilitate a better testing environment), we've reduced the cooldown for PTR character copies from 72 hours to 24 hours, effective immediately. 

This means that if you copy over your characters to the PTR today, you will be able to copy them again after only 24 hours.


This also means that if you have a character copy cooldown active right now, it's time has been reduced to 24 hours and may have already expired as a result.
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원래 본섭에서 PTR로 캐릭터를 복사한 후 다시 한 번 본섭 캐릭터를 복사해 오려면 72시간을 기다려야 하는데, 이 시간이 너무 길다는 얘기가 많아서 24시간으로 줄였다고 합니다.