Light Schedual

so i put my girl into flowering, the only thing is, i have her set for 12am light goes off, and 12pm light goes on. i go to work before my light comes on, so im not here to raise my light if need be or water. so if i changed the timer back one hour every couple of days to where id at least have an hour with it before the light goes off and when it turns on. how much would it affect it and how bad would it be?

You can change it incrementally throughout the week until you have the schedule you want, but you can't cut the darkness, more dark is okay though.