No one yet knows what the data substrate includes or how much of it has to be preserved for meaningful revival. For all we know, a piece of neocortex dropped into liquid nitrogen might do the trick in a pinch. Or maybe not even the best current cryo techniques would be enough. But it is not really possible to give a meaningful estimate, as cryonics does not appear to be in any reference class for which well-calibrated predictions exist.
No one yet knows what the data substrate includes or how much of it has to be preserved for meaningful revival. For all we know, a piece of neocortex dropped into liquid nitrogen might do the trick in a pinch. Or maybe not even the best current cryo techniques would be enough. But it is not really possible to give a meaningful estimate, as cryonics does not appear to be in any reference class for which well-calibrated predictions exist.