Clone timing under a "long" floresant ???

Okay heres the story...we had to move across the country prettysmuch and now as a medical mmj patient here in Colorado I have total access (right this minute only though) to grab some White Widow Clones...It's my all time favorite for sure and works best with my chronic pains. Anyway, all we can afford at the moment is usuing the one very long floresant ballast and buy a new "blue spectrum" gro bulb for it. However, my question is the following...
We want to do this technique for now until atleast 3 weeks from now when we get enough funds to buy the correct lighting again for both rooms. Anyway does anyone know for what the recommended time frame that "clones" can be kept under a floresant before it harmsthe plant itself ???

Basically could we do this until we got up enough funds to do it right in about 3-4 weeks away ?

Thanks in advance for anyone that can help with this issue as well. :)

Brightest Blessings to all your crops and harvests to come!

~Piscian-Rainbow