The optimum MVP for me would just be a website that displays a list of HN users who are currently online in Skype along with a link to their HN profile. I don'

The optimum MVP for me would just be a website that displays a list of HN users who are currently online in Skype along with a link to their HN profile. I don't even have to change any behavior to become "available" or not on your service. Office hours as such are a non-feature for me. I will never set any, and I won't look at anyone's unless I'm actually trying to contact them (in which case I would probably write them an e-mail over trying to schedule an appointment).