###HUMAN: What is the time/retired of Driver Masten Gregory Carroll Shelby when the constructor was Maserati, the Grid was larger than 10 and there were more than 2 laps?, ###ASSISTANT: SELECT "Time/Retired" FROM table_11847 WHERE "Grid" > '10' AND "Laps" > '2' AND "Constructor" = 'maserati' AND "Driver" = 'masten gregory carroll shelby'