That's not too unreasonable, if we count the Succession War as independent of Dark Continent (despite being in the middle of it). By that logic he'd be partway through 2 of ~3-4 with the setup for the 3rd already taken care of. But then again, the combination of Succession War/Dark Continent is liable to be Chimera Ant-size, if not close to it each. So... dunno how feasible that'll be at this rate.
He should let someone else do the drawing.