It was installed it about 12-15 days ago and some people are already at 20+ days.
Quote from Peaches:
It seems to count for as many computers and sessions you signed on at, until they expired. If inactive, our cookies expire in 1 week. The whole thing seems to be messed up, so ignore it. lol
I even went up 5 days in 1 day.
So don't be depressed if your time is higher or lower than you would like it to be.