Well I've got Toons from 12 to 157 Days Offline, and just the other day I had an 8 day min, no problems. I'm guessing that it isn't always noticeable because of the Dates involved, only noticeable in cases such as Blargeth has captured in the pic, either way though, Cath's right. It most likely hasn't worked "properly" since it's creation.
Darn....