: )
Hi KROG...

A plant can be started/grown under 18-24 hours of light from seed/clone and this lighting regement can be conitnued forever...

A plant has three stages...
1 Germination/seedling/clone - 18+ hours of light
2 vegetative - 18+ hours of light
3 flowering - 12 hours of light and 12 hours of uninterupted darkness

When you want the plant to flower you reduce the light to 12 hours of light and 12 hours of complete uninterrupted darkness.. the plant them "thinks" winter is coming and begins to make seeds or buds depending on if pollenation occured...

It "does not matter" wheather you grow in the seedling/clone and vegetative stages with 18,19,20,21,22,23, or 24 hours of light...

18-24 hours works.. it has been debated which method is the best.. but "everyone agrees" that any number of hours of light beyond 18 hours WORKs...

is this what you wanted clarified?

iloveyou