I've had a friend that GMED it in a day. So I guess it depends if you want to go around and use the skill on NPCS constantly. If you use it just with magery, be prepared for slow gains.

Hint:
Gain like 3-5 times off a NPC, then find another npc to train Eval Int

What I think is unfair is the fact some players started with 3 GM Skills when they started this shard. Because I'm still working on Eval Int/Resist after playing for a lot of hours.