I've noticed that there is a regular rhythm to daily forum activity. I work from 8AM-3PM or thereabouts, and I usually check in to the forums at least a couple times a day (unless it's crazy busy in my office, which is not unusual!). In the morning there are usually a few people around and posting (Haf often posts at 6-7AM), but by noontime it usually trickles away, and then after lunch it's often as dead as a tomb for a couple hours. What time of day are you most active on the forums?
For the sake of simplicity we'll keep it to CN server times (US Central Time).