Here in my country Chile, I have see one course extremely expensive, at least for me.
One class 3 hours 54 US dollars. The class was for a maximum of 12 people.
The price was expensive, so I think the class never happened. No famous guy or designer.
If you pretend to do more classes in future the price should be cheap. So the guy could get another one and learn how to teach. I would pay between 5 dollar to 10 dollar per hour. I think it should be ok 10 dollar per hour because of my income is enough to pay that price and I think it is fair. But think in the prices of your country and if the person have enough to money to pay, if she or he is a young student you should put a price more attractive like 5 dollar the hour.
The prices could be expensive or cheap depending of the income in your country. So think in others courses.
if i had a lot of young student (they have no money, maybe 20 students) I would put a price of 10 dollars at month four or five classes.

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