CREATE TABLE table_54424 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the least number of laps for the driver Jo Siffert?
SELECT MIN("Laps") FROM table_54424 WHERE "Driver" = 'jo siffert'
SELECT MIN("Laps") FROM "table_54424" WHERE "Driver" = 'jo siffert'