Milliseconds. In fact; I grow a lot of garlic every year and have never seen the problems you describe. But hey, if store garlic is "good enough," so be it. For many of us, as well as my increasing number of relatives, it isn't. The phrasing of the OP makes me curious. Very curious.
Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic Zone 5/4 in upstate New York, 1420' elevation. NY WO G