miraculous-lbcn:

“You’re still inexperienced young superheroes. Incapable of staying transformed after using your powers.” – Hawkmoth

That means there is a way to stay transformed longer and that Gabriel has been able to learn and master it at some point.

I seriously need to know the backstory of Gabriel and Emilie and how they got the Miraculous and how the Peacock one came to be damaged? Or maybe just dangerous in its nature?