It is a very, very short time span to validate a miracle. Additional problems: (1) the Church has become somewhat careless about deciding what is miraculous – with particular reference to canonization, which no longer has a devil’s advocate process; (2) the Church has become sullied by irenicism and consequently the truth standard within the minds of the faithful and the hierarchy is lowered; and (3) the devil can also work changes of different kinds, and lay people are not qualified to know the difference. Finally, as has been noted by others, validity is not a function of the occurrence of miracles, but rather of Form, Matter, and Intent. (Also, the sacraments are not magic, but require our participation: they “work” even if we are not engaged, but we make ourselves ready for the sacraments, and thus gain all the more from them.)