Personally, I think I'd have a hard time charging a friend for "my time" if I were doing a favor. I'll drive to my friends' place to fix their computer, which could take upwards of two hours. If I'm doing it as a friend, its simply just a cost that I'm willing to incur.
However -- if you really don't know this guy well and its more a business thing than a favor thing, I think a "tip" wouldn't be unfair. You tip waiters and waitresses 10-20% based on how well they do their job, so certainly that wouldn't be unfair to you.. ?
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