It will take two years for the government to very slowly build the myth that we have 'won' in Afghanistan and that the Afghans will take to deomracy like ducks to water - all good, well done chaps, cheers all round.
The reailty, as history has shown, will be the same as when the Russians left - the Afggahn people were left in a state of chaos, and they were very keen to welcome an ogranisation who could come in and establish a sense of order which the Afghans understand (note to Western governments: this may not be the same as democracy forced by military invasion) and such an organisation did duly appear - they are called the Taliban, and they are just waiting their time as they have done before.
As I have opined previously - the Taliban only ever have to wait for any invading force to go home, which is easy for them - they are not going anywhere, they are home already.