CREATE TABLE table_24492 ("Week of" TEXT, "Tournament" TEXT, "Champion" TEXT, "Runner-up" TEXT, "Semifinalists" TEXT, "Quarterfinalists" TEXT)

How many weeks are shown for the champion of john mcenroe 6 2, 6 3?
SELECT COUNT("Week of") FROM table_24492 WHERE "Champion" = 'John McEnroe 6–2, 6–3'
SELECT COUNT("Week of") FROM "table_24492" WHERE "Champion" = 'John McEnroe 6–2, 6–3'