; (3) not fewer than 3 buses are assigned to each of the El Paso, Laredo, Rio Grande Valley, San Diego, and Tucson sectors and parked (when not in use) at a U.S. Customs and Border Protection facility located in the respective sector; and (4) not fewer than 2 buses are assigned to each of the Big Bend, Del Rio, El Centro, and Yuma sectors and parked (when not in use) at a U.S. Customs and Border Protection facility located in the respective sector. (b) Relocation Buses assigned to specific Border Patrol Sectors pursuant to subsection (a) may be relocated to other sectors in response to changing immigration patterns. (c) Reducing wait times at remote border patrol stations The Commissioner shall ensure that sufficient buses are available in each border patrol sector to avoid subjecting detainees to long wait times at remote border patrol stations. (d) Reporting requirement The Secretary of Homeland Security shall submit quarterly reports to the appropriate congressional committees regarding the average length of detainees’ stay at border patrol processing centers.