Right exactly now my Author Score is 100, but it could drop before the end of the day. I've had Hub's reach 100 after 2 weeks or so, then drop back down to the 90's then the 80's then back up again. Some have never reached 100 as well. It just depends on how much it is read and voted on I suppose.
I have no idea how or why it does this. It makes me happy to see it go up but I've learned not to depend on it staying there.