How much do you think your time is worth? Do you want it more for the money or for your resume? (Where I'm working I get near $30/hr while someone else is doing the same thing for free to pad his resume.)
Figure out how much you want total and how long it'll take and see what you think you should get. Then add a little to it.
Also, know that he is a friend's dad so do got out for too much of a killing.
I guess if it is your 1st job charge less. Charge more the 2nd time and beyond for "your experience."
Just my opinion,
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