The only way to tell is to look at the base of the cutting and see if it has rooted. I am pretty aggressive when it comes to checking on root-growth, because I want to know this before starting a water/fertilizer regimen. I would loosen the soil with my fingers, gently loosening the roots/cutting, then turn the pot upside down, holding the cutting at the base which would literally allow the root-ball (if there is one) to separate from the pot. If there is a root-ball, great. Put it back into the pot, add potting soil if necessary, and begin to water and weakly fertilize the plant. If there is no roots, well, you'll just continue with what you were doing.
By the way, did you see the results that Lucky had re-hydrating his cutting?
