St. Nekatrios died in 1920 and was made a saint in 1961.
If Blessed Seraphim Rose was on the same caliber of holiness as St. Nektarios, he will become a saint in the same order of time. The following excerpt is from the Ionian Village website
In this bed lay a paralytic, who once the undershirt landed upon him, was instantly healed and jumped out of bed praising God for his miraculous healing. This was the first of many miracles that St. Nektarios began to perform in death. The stories of these miracles, along with his body remaining completely in tact and emanating a magnificent fragrance for twenty years after his death, led the nuns at the monastery to venerate him as a Saint of the Church. Finally, in April of 1961, the Ecumenical Patriarch of Constantinople further blessed St. Nektarios with a proclamation of Sainthood.