CREATE TABLE table_204_776 (id DECIMAL, "site" TEXT, "date ( s ) " TEXT, "designated" DECIMAL, "location" TEXT, "description" TEXT)

what is the differece in years from date to designated to for gray nuns ' hospital ?
SELECT ABS("date(s)" - "designated") FROM table_204_776 WHERE "site" = "grey nuns' hospital"
SELECT ABS("date(s)" - "designated") FROM "table_204_776" WHERE "grey nuns' hospital" = "site"