What season is it now where you are?
If your rootstock is growing well, your scions should take off quickly too. It could take more than a month with some late season grafts but often you can tell is it is a bust in a few weeks. If the scions are still looking good, I will keep them on and see what happens. Also look at the rootscock branch just below the graft, make sure the branch is not starting to die back from being cut. I have seen this happen more than once and a scion I moved when I caught it quickly did fine on its new location.