I expect it to be quite easy to level based on how the game works. XP scales in XIV. SO even if it is 2.5million xp expect to see those fates giving you 100k-150k xp per gold. Aka to level from 30=>31 in XIV it required the same time commitment more or less as 49=>50.

In XI your XP increased based on level. In the end it ended up being an exponential grind which was eventually lowered to make it easier. I believe levels 70-75 was the same xp as 1-70 at one point. XI now they throw xp at you at rates that makes the leveling in XIV seem like a nightmare grind so I will not reference Post-Abysea XI. Old XI XP did not scale. You were getting 250-300xp a kill at level 15 and you are getting 300xp a kill at level 74. So each level took longer to obtain, especially pre-ToAU expansion.

I expect an hour per level or so at the max in XIV. So maby 10-12 hours per class to get it to cap from 50.