It's not a matter of time, when they are ready. You should see roots coming through the Rapid Rooters you are using between 1 and 2 weeks. More roots is a good thing.
Once they are rooted, I put my clones in 16oz party cups with straight FFOF and let them grow up a bit (using CFL's & Flouro's), before I put them under HID.
I have some getting ready right now. After my last crop is dried, I will put them in my 3 X 4 X 7 ft. 400 watt grow box.
Sounds like they are doing just fine, remember patience