CREATE TABLE table_54239 ("Driver" CLOB, "Constructor" CLOB, "Laps" FLOAT, "Time/Retired" CLOB, "Grid" FLOAT)

how many laps were there when the grid was 24?
SELECT COUNT("Laps") FROM table_54239 WHERE "Grid" = '24'
SELECT COUNT("Laps") FROM "table_54239" WHERE "Grid" = '24'