Er...I've been wondering about this for some time. I've noticed that some moderators have become inactive, and I was wondering how long it you to realize that they are gone, and perhaps demod them and mod someone else. Two of the type of mods I'm referring to are Elite Dragon Trainer and Murgatroyd.
In my 8+ months of being here, I've not once seen a moderation done by Elite Dragon Trainer. And (s)he's been inactive since the 19th of January.
Murgatroyd's internet connection couldn't have died, due to the fact that he was last active here on the 29th of January, I believe, and last active at Bulbagarden on the 15th of February.