If you pick up every quest you see then probably not. I'd suggest levelling up your first level 50 class only doing the main storyline, class quests and sub quests from the region/area of your starting city. Then when you go to level your second class (hopefully from another starting city) you have all the class quests and sub quests for that area and so on. This will help you get two other classes well on their way but after that it is the grind of dungeons and so on (remember dungeons now actually are much more useful than fates and you get loot).