In my opinion, activity isn't based on hours per week, fortnight or even month, it's based on how much you contribute to the server, and how much you participate, whether that means playing 10 hours a day or 2 a week, both of those people could have the same impact on the community. Along with this, activity is fluid and changes constantly dependent on a person's schedule. I think if someone is having a positive impact to their regiment, and playing the server a few times a week (for any amount of time, really) they could be considered active. I don't think just because someone has 100 hours in a fortnight it makes them active.