CREATE TABLE table_30536 ("Episode" FLOAT, "1st season" TEXT, "2nd season" TEXT, "3rd season" TEXT, "4th season" TEXT, "5th season" TEXT, "6th season" TEXT, "7th season" TEXT)

How many 7th season episodes had 2nd season viewerships of 6 594 469?
SELECT COUNT("7th season") FROM table_30536 WHERE "2nd season" = '6 594 469'
SELECT COUNT("7th season") FROM "table_30536" WHERE "2nd season" = '6 594 469'