It is always tempting to add fish as soon as you can, but the best thing you can do is wait. How long should you wait? Well that really depends. When cycling a tank you should check your water daily and record it. You will be able to see where in the cycle your tank is. I had bought cured liverock for my nano tank from a lfs and didn't see much change in my water parameters but i still waited around a month before adding anything.
Something to keep in mind is that the longer you leave your tank fishless the longer all of the micro fauna has a chance to get established without being eating by your fish. Anthony Calfo talks in one of his books about waiting a year before adding fish so that all of your microfauna like copepods can multiple and fill all of your rockwork and sand area.
So in the end there really isn't any set time you should wait. Watch you tank parameters. When everything gets to zero then it is time to add a fish or two. I actually waited a year before adding fish to my aquapod but during that time i started adding soft corals to my tank.
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