I run mine with my veg plants at 18/6. If i had the space, you can speed up the process with 12/12. As long as you have a 6 hr rest period for the root development, you'll be fine. I lose about 5 days when i 18/6 vs the 12/12. I'm in no hurry now, so it works great for me.

Most strains will root around 14 days. Be patient, they will root.

g/l