Your instructor would MUCH rather stand out there and help you fly than see you damage your plane. As I tell my students, I will be out there with them as long as they need me OR as long as they want me. Whether that be 2 flights or a year, what ever it takes. Putting a set time limit on it is a sure way to trouble. Sure, you can quickly get a general idea but some are naturals and some are airborne disasters that take longer or should take up tiddly-winks. Even once off the buddy box, I'm sure he would be glad to go out and "advise" you. When you try some advanced maneuvers, you may want to do them on the buddy for the first try or two until you know you can recover from possible errors. Take your time.