Hard to calculate, as I come and go mostly. I log on sometimes at work during the day, but rarely post, just take a look inbetween working, duck in and out. Same for the evening, I always check in but only sometimes post, depends on what is going on, I sometimes go through phases where I post a lot in one night.
You have to also realize that when a person leaves IWs, their name will still remain on Who's Online for a time. Dunno exactly what IWs is set for, 15 minutes is the usual time, but it could be 30 minutes as well, i.e., your name will remain on Who's Online for a time after you leave, even though you are gone. In other words, people like me who come and go may seem to always be online, but is not always the case.
