CREATE TABLE table_14613 ("Year" TEXT, "Start" TEXT, "Qual" TEXT, "Rank" TEXT, "Finish" TEXT, "Laps" FLOAT)

How many laps did Duke Nelson complete when his qualifying time was 122.951?
SELECT SUM("Laps") FROM table_14613 WHERE "Qual" = '122.951'
SELECT SUM("Laps") FROM "table_14613" WHERE "Qual" = '122.951'