Oakley Sutro lite photochromic lense clear to dark transition

my brand-new Oakley Sutro I just got showing you guys the transition from Clear too dark
they change really fast and transition back to clear very fast as well

[@ivanuh]

I bought them, they are really nice! 👍🏽

[@josecastillo1883]

How fast so they go back to clear??

[@michakurowski2348]

How much?