Found this recommendation on another forum...makes good sense. When i start taking lessons i am going to do this!

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I stumbled onto this method, but I think it's a nice trick. Find out what the teacher's last lesson is for the day/night and get the last slot if you can. This way if he's into teaching and the stuff you're working on, he'll spend a lot of extra time working with you on the stuff. If it's the last lesson there's no student knocking on the door to get you out of the seat, so if the teacher doesn't mind you can stay pretty late.