3-5 hours seems on the high side, but other than that I wouldn't say it's strange. And what are you skeptical about? That they are getting free work out of you?

3-5 hours seems on the high side, but other than that I wouldn't say it's strange. And what are you skeptical about? That they are getting free work out of you? Out-sourcing a 3 hour job to a college senior simply doesn't make sense.