What are the typical control throws for a 1/10 scale high wing airplane ( 42" ) four channel?

There's no stock answer. It depends on how you want it to fly. But a decent place to start would be 3/16 each way on the ailerons and elevator and 5/16 to 3/8 each way on the rudder. Make these a little less for a trainer and a little more to suit yourself if you're after a more snappy response.