You know, there actually isn't any mechanic behind the Lisa/Fury transformation. As by what I've rolled, it's Lisa herself who has those stats and powers. But I wanted to funnel it into a semi-She-hulk like character who transforms into an 8' tall, red rage woman, who is semi-aware (can tell friend from foe and neutrals/civvies), but solves her problems usually by smashing them.

So how long does it take for her to transform into Fury? About as long or as quick as the plot needs.