If I remember, RdB usually takes at least 3 weeks to start rooting. I seem to remember 19 days one some and 24 or so on others. So far, that one up top looks happy. If it gets too many leaves w/o roots, the leaves will wilt and fall off. If that heppens, you might be tempted to give it extra water, but don't! As long as the medium is just barely moist, you shouldn't get any rot and will eventually get roots. Leaves, if lost, will come back later.