Phil Keoghan blamed busy schedules for why an all-celebrity season of “The Amazing Race” may never happen. “I think one of the hard parts of it would be aligning everybody’s schedules, because so many celebrities are so booked up and their schedules are so tight,” Keoghan exclusively told Page Six while promoting the show’s crossover episode with “Hacks.” The host of the CBS reality series said “Celebrity Amazing Race” would only work if it were shorter than regular seasons. Phil Keoghan (seen above) told Page Six that celebrities’ busy schedules are the major issue in why an all-celeb season may never happen. ©CBS/Courtesy Everett Collection Koeghan (pictured above on the CBS reality show) said the celebrity season would only work if it’s shorter than regular seasons. ©CBS/Courtesy Everett Collection “It would have to be a limited run, maybe reducing the number of episodes and maybe running a shorter distance,” he told us.…