That's because it changes every time we have a class.  The first class to upgrade was just announced about a month ago, and I believe the new captains had about three years here.  However, this in no way indicates how long it would take YOU to upgrade if you started tomorrow.  We are purchasing 3 jets a month, and have plans to hire about 600 pilots this year.  And, if you have the time, you may skip over people senior to you that do not.  I think the upgrade time is going to go way down.  Of course, not many other airlines are hiring, so I'm not sure if you are going to make a decision based on upgrade times.  I'm personally very happy that we require 3000 hours to upgrade.  I think that's a bare minimum.  Good luck to you, and I hope this answers your question.