CREATE TABLE table_30210 ("Event Date" TEXT, "Event Day" TEXT, "Approx. Duration" TEXT, "Starting Time" TEXT, "Event Details" TEXT)

What is every value for approximate duration when event details is women's foil?
SELECT "Approx. Duration" FROM table_30210 WHERE "Event Details" = 'Women''s Foil'
SELECT "Approx. Duration" FROM "table_30210" WHERE "Event Details" = 'Women\'s Foil'