How long am I a transmutation after using the transmutator?

Question

Let's say I use a teleport scroll in the room after transforming into a rotworm so I don't go into the area where it clears me from the transmutation. How long do I stay like a rotworm exactly?

Answer 1

Player stays transmutated for exactly 30 real-life minutes. Each transmutation lasts for the same amount of time.