Geez, you’ve missed the point entirely!! It doesn’t matter if we can do it in 6 months with the extra troops. By using ANY sort of a date it allows the enemy to go home, lay low and KNOW the enemy is leaving on a date certain.
It is the STUPIDEST and most poorly thought out strategy imaginable. It was done for one reason, to appease his anti American base. he has all but guaranteed Afghanistan will become another Viet Nam.