CREATE TABLE table_69502 ("Year" TEXT, "Start" TEXT, "Qual" TEXT, "Rank" TEXT, "Finish" TEXT, "Laps" FLOAT)

What is the highest number of laps with a 21 start?
SELECT MAX("Laps") FROM table_69502 WHERE "Start" = '21'
SELECT MAX("Laps") FROM "table_69502" WHERE "Start" = '21'