Vegetative light period

I was given a clone of Dutch Passion. The grower told me to keep it under 24 hours of light. I placed it in the grow room where I keep two Mind Bender plants started from seedlings. I keep the cycle for the Mind Bender at 18 on/6 off. Is this a good amount of light for the clone as well? I want to make the clone a mother plant. How much light would I use to keep her alive but not flower her?
Gahanna, Ohio

All of the plants will continue to grow vegetatively under 18 hours of light and 6 hours of darkness each day. However, for faster growth, the regimen could be changed to continuous light.

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