Hi Tommy,
I would recommend 16 or 18 hours of ( if possible ) dimmed light. If you cant dim then raise the light as high as possible in the room or tent. When she is about 4-5 cm tall turn the light to half the height or dim to 30-50%.
And then when she has leaves and is about a week or two start dimming to 70-80% or hang the light 50-70 cm above the plant.
Hope this helps!