1-30 in 18 hours seems very slow w/ GC mats. Heck, I remember leveling Btn being more of a factor of how many leves I had left and not a time thing. I would check /r/ffxiv, but some of the leveling leves are much better than others when it comes to exp. I don't remember the exact ones, but I do remember that there was in order for turning them in and getting a certain one renewed every time for more exp.