Here's a link to a graph of the mana regen for my IGOT: https://www.desmos.com/calculator/swro9m8viv
The build I'm using is FR7,FR9,AN1,AN3,AN6,AN8,DD2,DD6,FC5,FC7,DN2,DW4,SP:Fairy Chanting,SP:Diamond Pickaxe
That graph was back around r8, I believe. It would have to be scaled up a lot for later reincarnations, like r19. The change in slope is accurate, it would simply need scaling.
X axis is hours spent in that game, and Y axis is mana regen in m/s
Here's a link to a graph of the mana regen for my IGOT: https://www.desmos.com/calculator/swro9m8viv
The build I'm using is FR7,FR9,AN1,AN3,AN6,AN8,DD2,DD6,FC5,FC7,DN2,DW4,SP:Fairy Chanting,SP:Diamond Pickaxe