NEW : Gen. Stanley McChrystal talks with CNN 's Christiane Amanpour about insurgency . General David Petraeus : Full evaluations of progress should wait until December 2010 . Petraeus : Progress ` ` likely will be slower '' to come in Afghanistan than it was in Pakistan . Karzai 's ` ` aspirational '' policies would cost U.S. about $ 10 billion a year , he says .
NEW : Gen. Stanley McChrystal talks with CNN 's Christiane Amanpour about insurgency . Gen. David Petraeus : Full evaluations of progress should wait until December 2010 . Petraeus : Progress `` likely will be slower '' to come in Afghanistan than it was in Iraq . Karzai 's `` aspirational '' goals would cost U.S. about $ 10 billion a year , Petraeus says .