Autoflowering light cycle?

I want to do a CFL grow with fem autoflowering seeds, what should my light cycle be? just 24 hour straight or 18/6,12/12????

im doing 20/4 i heard its pretty good

Well you should be able to go 24/0 or 18/6.
12/12 is usually just for flowering. 24 hrs light usually gives slightly better results but 18/6 is cheaper to run. In theory you shouldn't have to alter this to 12/12 for flowering but not all auto's are true autoflowering, like mine, which have been in pre-flower for a while, and I'm gonna have to change em over lol.