I figure one hour per day is used for regular duties of the job, perhaps tack on another hour per week for odd jobs they need done. I'm here from 8:30 until 5, so let's round that down to eight hours, minus one for lunch, minus one for regular things, leaves six hours. Times five is thirty, minus... well, let's call it minus two, so twenty-eight hours per week, as a full-time job, to do this.