I thought this would be documented somewhere, but I couldn't find anything. How long does it take to rank up a given monster?
Just ranked up a Tarzape, which took 90s, or 1/4th of the hatching time. It seems for legendaries, ranking up takes anything between 16h and 32h.
Of course, currently I'm interested in the rank up time for rare monsters. Given the current war restrictions I'd like to know which monsters to rank up, as I have enough cells for many of them. But if I start ranking and it takes 12h then I'm kinda bummed :)