I leave lights of 24 hours then put the light on 11 and 13 and keep it at that will notice it starts to pressure flower then flower a few days earlier than just flipping to 12 12 give it a shot growmie I'll have good results I promise.. 1<3 and good luck..
Personally I switch to 12/12 after lights on which creates a 14hr transition day before the full 12/12 switch day.
The 24hr of darkness is unproven. Some people swear by it and claim it necessary for true sativas I call broscience.
Just go to 12/12.
Some people like to imitate nature a bit more closely and will drop one hour each week until they reach 12/12 and claim this is more plant friendly.
Either way, the plants will flower.