Completion of Security Advisory Opinion (SAO) responses depends on the extent of review and coordination required, the amount of derogatory information, which other agencies have responsive information, the timing of when each partner agency completes its review, and a variety of other factors, such as emergent circumstances such as COVID, SAO request volume, or the need to facilitate travel in the national interest (e.g., for the U.S. government to comply with international obligations to facilitate travel to the United Nations) or to address emerging threats, and foreign policy priorities. Because of the complexity of this process, SAO requests can be neither addressed nor resolved in a first-in-first-out basis. That said, generally, security vetting is concluded in 75 percent of visa cases requiring additional security vetting in approximately 120 days. Security vetting is concluded in over 90 percent of all cases requiring additional security vetting in less than 24 months.