I was told AE has 2900 pilots. At 35% of each new hire AA class , it would mean AA had to hire 8285 pilots to absorb all 2900 at the 35% ratio.( I know, I shouldn't do math in public).
I seriously doubt AA could do that in 5 years.
However , with an average pilot age of about 50 at AA, it might not be that much more then 5-10 years to go through the whole AE list.