Does anyone know what the rested XP maximum limit is?

[Alhanelem]

It's a good question. A dev response about the detailed specifics of the rested exp mechanics would be awesome.

(How much rested exp can you accumulate, how long does it take, what's the rate of rested exp/hour, is it a flat rate, etc)

It has to be a flat rate because you get the same amount of rested exp when you change classes. If it wasnt a flat rate, you'd probably get more on a higher level class but then it would have to stay on that class.

I don't know what the limit is, but it can certainly fill up the entire bar plus more from nothing.