20 years in Afghanistan equated to:

Human Cost: 121,199 people (American service members: 2,448, U.S. contractors: 3,846, Afghan national military and police: 66,000, allied service members, including from other NATO member states: 1,144, Afghan civilians: 47,245, Taliban and other opposition fighters: 51,191, Aid workers: 444, Journalists: 72)

Monetary Cost: $2.27 Trillion Dollars, only to have the primary objective/enemy to take over within 10 days.