Task: Question Generation
Input (English): Passage: On May 30, 2006, SCDOT announced its preferred routing of I-73 between Myrtle Beach and Interstate 95 in South Carolina.  I-73 will begin where South Carolina Highway 22 (SC 22) starts at U.S. Route 17 in South Carolina near Briarcliffe Acres, South Carolina. It will then proceed northwest crossing the proposed routing of I-74 (currently South Carolina Highway 31, the Carolina Bays Parkway). After passing Conway, South Carolina, I-73 will leave SC 22 at a new interchange to be constructed  west of U.S. Route 701, and will then use a new highway to be built between SC 22 and South Carolina Highway 917 north of Cool Spring, South Carolina. I-73 will then use an upgraded SC 917 to cross the Little Pee Dee River. It will then proceed on a new freeway alignment between SC 917 and Interstate 95 in South Carolina that would have an interchange with U.S. Route 76 in South Carolina west of Mullins and then would proceed northwest to an exit with U.S. Route 501 near Latta, passing that city to the south before intersecting I-95 near South Carolina Highway 38. After crossing I-95, I-73 will use the chosen middle route, one of six potential alternative corridors that were studied all of which roughly paralleling SC 38 to proceed further north to the North Carolina state line. These alternative corridors were formally announced to the public on September 7, 2006, at a meeting in Bennettsville, South Carolina. The number of possible routes was reduced to three, and a final decision on the preferred northern route was announced on July 19, 2007. The central route caused the least disruption to homes, farms and wetlands. The North Carolina Department of Transportation and South Carolina Department of Transportation Carolina departments of transportation previously agreed to an I-73 corridor crossing the state line along SC  and NC 38 near Hamlet, North Carolina, on February 11, 2005. Previously I-73 had been planned to cross the state line further west, near U.S. Route 1 in North Carolina south of Rockingham, North Carolina.
Output (English): How many days after SCDOT announced its preferred routing of I-73 between Myrtle Beach and Interstate 95 in South Carolina were alternative corridors formally announced to the public at a meeting in Bennettsville, South Carolina?