Final step
An eternity of agony passed on. Rui had no idea how much time had passed since the commencement of the evolution procedure. His internal clock had completely been shot thanks to all the pain, and even metabolic phenomena were no longer reliable because of how much his body was rapidly changing. Due to that, things like hunger and thirst were no longer reliable indicators of how much time had passed since he had consumed any food.
The procedure didn't have a defined time limit. This was because everybody had different physiologies and metabolisms that caused the procedure to require different amounts of time to complete successfully.