hmm, so one thing that's mentioned is that mana capacity is improved via training - the more time you spend training the higher it gets.

I wonder how mana regeneration rate is affected. If most people recover their full mana capacity over the course of a day, then someone like Frieren would recovery the daily capacity of a basic mage within the span of 2.4hrs, which would allow her to be much more liberal with her spells.

If recovery rate is separate from capacity, then mana would be treated as a rarer, stockpiled resource like Tohsaka Rin's gems (or a blood bank).