Not a correlations really. Some root faster than others, especially sativa's love water culture. There's to many factors to give a straight answer. To try to give and example and explain the problem with the question is that you could have a crazy fast rooting clone that roots faster than everything else but still turns out to be hermie.
You look for a mom with desired traits, it doesn't matter if a clone take 7 or 11 days to start forming roots in practicality. You plan ahead in gardening comes harvest. That includes rooting cuttings etc.
A healthy cut is the most important for rooting speed.