Rumor has it that SsethTzeentach and Mandalore are the same person, but we will never know for sure. The audience can only listen to the voice and make their own conclusions.
A hunter in the guild I ran (we rolled onto a new server) did exactly that. 3 days. I felt bad for taking an entire week to hit 60, when fifteen members (incl warriors) hit 60 in the first five days.
It's a pretty easy speedrun, and the community's been doing it since literally 2004. Here's a really fast example from 2006:
Sseth is based in EU (and makes little secret on that), Mandalore is in US.