It’s a loaded question actually, you can but most shouldn’t.
@MrPeat does and he loves to tell people that it works great for him BUT you don’t have his setup, Ps what lighting system do you use again some cmh/HPS system? How big?
The thing to understand here is while autos ei grow on any light scedule they like all cannabis are hungry, hungry for nutrients and hungry for energy in the form of light.
Depending on how strong your lights are will depend on how short you can cut your lighting period while still getting decent results.
For example a 20w cfl on for 20hr is not going to match my 320xl HLG led on for 12hr.
But then again my kingbright 480w IR&UV is going to produce better results on for 20hr then my 320xl on for 20hr. It’s all about radiation energy emmited by lighting that the plant can absorb