First, I think my first post left out some context so I should be a bit more explicit that the job is being an interviewer: You interview software engineering candidates on behalf of our clients. (Possible you already get this, but mentioning it just in case.)
As for the 10 hours, we spend a lot of time onboarding and then continuously training our interviewers. Between that and the overhead of managing the relationship with the interviewer, we find things work best with interviewers above a certain activity level. Put another way, it's easier to work with 10 interviewers doing 10 hours a week each than 100 interviewers doing 1 hour a week each.
As for the 10 hours, we spend a lot of time onboarding and then continuously training our interviewers. Between that and the overhead of managing the relationship with the interviewer, we find things work best with interviewers above a certain activity level. Put another way, it's easier to work with 10 interviewers doing 10 hours a week each than 100 interviewers doing 1 hour a week each.
Does that make sense?