CREATE TABLE table_66818 ("Year" TEXT, "Start" TEXT, "Qual" TEXT, "Rank" TEXT, "Finish" TEXT, "Laps" FLOAT)

How many laps were there when the start was 12?
SELECT COUNT("Laps") FROM table_66818 WHERE "Start" = '12'
SELECT COUNT("Laps") FROM "table_66818" WHERE "Start" = '12'