Assuming we only got only 10 categories per job, farmed 2 Job Points a hour, and the amount of points needed for the next level of a category goes up by the current rate, you're looking at 465 JPs per category, 4650 JPs in total, at the assumed rate that's 2325 hours of farming, nearly 100 days of full, non-stop, farming for Job Points at the exact same rate at all times.

That's 10 categories per job, from what I recall someone said the UI is setup to allow for 30+, so if they have more than 10 for each job then you're looking at an even higher amount. Also mind you this is all for a single job, god forbid you play a second job at which point it'd become so ludicrous that you'd take years for you to finish even if you never stopped.

Simply put, the rate needs increased, not to the point of making them an overnight finished thing but to the point of making them worth the time to actually do it or care about it. Right now I do events like Delve and Skirmish all the time, the amount of points I get from them isn't enough to get my Magic Accuracy on RDM capped out and it's the only job I even play, it's at 6 points right now. If I can't even cap one thing after a few months of playing my only job in events that give these points then the rate isn't high enough for getting them as you go, not even close.