Look, we have spent more money — we spend more money in three weeks on combat in Iraq than we've spent on the entirety of the last seven years that we have been in Afghanistan building that country. Let me say it again. Three weeks in Iraq; seven years — seven years, or six and a half years, in Afghanistan.
Senator Biden appears to be contrasting the spending on combat operations in Iraq with the spending on reconstruction and other diplomatic activities ("building that country"). Over seven years (not including FY 09), according to the Congressional Research Service, the United States has spent $11.8 billion on foreign aid and diplomatic operations in Afghanistan. The Pentagon in FY 08 has spent $145 billion in Iraq. This works out to about $8.4 billion per three week period.