1-15: Hunting log
15-25: Leves
25-30: Fates
30-35: Leves
35-40: Fates/Leves
40-50: Fates/ Leves

When my girlfriend first started playing the game her computer delivery got delayed by two weeks and she would have missed her first in game event if she didn't have a character high enough to do all the legs of it. The above got her from 1-50 in about four days, only a few hours a day. Honestly I can't say I'd ever suggest that to anyone, but it's doable and I've done it for my own jobs/characters in the past.