The half life of Xanax is "Half-life Immediate release: 11.2 hours;[1] Extended release: 10.715.8 hours[2]" meaning if it's immediate release 1mg of a 2mg bar is metabolized at T:11.2h and a total of 1.5mg is metabolized at T+:22.4. Just an example but that means about 1.5 mg is about what is metabolized per day. Of course other factors exist. That's why I said about. So after 48 hours of your first dose about 1mg will be in your system before redosing the 2 mg bar. So after six days about 3mg would be in your system before metabolization and after redosing the 2mg that day and about 1.5 mg at the end of the day. Another 24 hours later .75mg. By day eight of initial dose assuming you stopped at beginning of day six about .375mg left. So by end of day ten less than .01mg would be in your system. That's end of day ten from initial dose. So by your timeline you'd still have an additional 4 days (I think you said you had a week from after your last bar) to further reduce it.
This was just an example of how half-lifes work. Not saying this is your exact outcome.