how long did it take to clean up after 9/11

The cleanup of debris at the World Trade Center site after the 9/11 attacks took approximately eight to nine months. Cleanup and recovery work proceeded around the clock, seven days a week, removing about 1.8 million tons of rubble. The extensive cleanup effort involved rescue workers, contractors, and thousands of laborers, and included not only debris removal but also remediation of dust and contamination in surrounding buildings. Although the main cleanup phase lasted about eight to nine months, finding debris and remains in the area continued for years afterward.