changing light cycle for auto plants to suit a non-autoflower?

I had started a few plants, two were autos and one was not. I kept them on 24 hour light and the one plant (auto purple) finished great and on time. but this other auto (auto #1) has had so many problems and has matured so slow. im ready to flower the other plant which is now huge. but im not trying to wait for the auto #1 to finish. so will I hurt the auto if I switch to 12/12 to flower out my other one? please let me know. thanks

it won't hurt at all it may actually speed it up maturing but that is just a guess
i know some growers will drop to 10\14 at the end of their flower cycle to speed up ripening

Your auto will be fine. Autoflowers grow on any light schedule however yields diminish with less light.

thanks man