Yep like Lordhooha said, until you switch 12/12 normal stains stay in veg, autos basically do it all on there own even without light change cause they have an internal genetic timer I guess.
My last autos were on 18/24 in veg then once flower started I made it 20/24, some do 24/24 yep 24/7 full light until harvest but i prefer to let them rest those 4hrs.
The one before that had a fixed 18/24 from start to finish, Autos love light it's their thing

. In theory I should 20/24 during autum/winter times cause even if the heat build up is noticable they still stay fine, whereas now i have a situation with 20/24, hot weather with damn heatwaves and finding myself using the AC more often compared to before

. I should have made this run 18/24 but I didn't expect these weather conditions

.
So until I make a room dedicated to keep everything 110% undercontrol it will always be an experience in some way or another. Even if I use the same strain for plants, something different happens, I accept it, cause they are living things and individuals so in my eyes they act different even if similar.
I'm mainly for Autos cause it saves me time and money.
I remember the first times

I was sure i had to switch them to 12/12 and was surprised they did their own thing and flowered without the switch.
I guess at the time I only thought autos grew faster but respected the same rules as normal strains

They do everything faster, average veg on most autos is 1 -1 1/2 months, flower can be 6-10 weeks so more or less the same time stay stay in veg but i usually harvest from 7-9th week of flower based upon their situation

Peac3