Hi
@Zippytripi! Clones are just like seeds, they need at least 18 hours of light but you can push to 22 or 24 depending on your own preferences. An organic root stimulator would help/speed up the process, but once again there are so many brands, it's up to you and what you can find locally, you better ask your closest growshop and see what's in stock. Happy growing 👊