In FFXI, when they originally raised the level cap, each new level added greatly inflated the amount of exp needed to complete. Meanwhile, mobs were dropping the same amount of exp that they always had: Monsters your own level granted 100 exp, and monsters above or below your level raised or decreased the same amount. Essentially, killing a monster (pretty much the only way to gain exp in FFXI at the time) filled a lower and lower percentage of your exp progress-to-next-level bar, the higher level you were. In FFXI, once you reached level 62, you had obtained approximately half the total exp you needed to get to level 75.

I do NOT expect them to follow the same pattern in this game as they did in that. In FFXIV, the game is much more endgame focused. Everything prior to level 50 is pretty much just a tutorial and can be breezed through pretty quickly. I expect the journey to level 60 will be much the same way - just long enough to get folks used to the new abilities and traits they'll get along the way. Very likely, it will be paced just right so that players proceding through the Main Scenario will get most of the exp they need just by doing Main Scenario quests, along with the occasional dungeon (just as was the case for the original Main Scenario with folks on their initial jobs).