One bad season at Florida was one too many for Dan Mullen. The standard for success when it comes to coaching the Gators is about as high as it can get in college football. Florida fired Mullen on Sunday, a day after his sixth loss in nine games, two months after the Gators went toe-to-toe with defending national champion Alabama and a year after they had a chance to make the College Football Playoff. “This is a place where you should have a high level of success over a long period of time,” Florida athletic director Scott Stricklin said. Mullen’s stunningly swift downfall and not-so-surprising departure ends a tumultuous two seasons that included mounting losses, numerous public relation missteps, NCAA sanctions and a victory against lower-division Samford that didn’t seem like much for Gators fans to celebrate. Stricklin said he made the decision Sunday morning and offered Mullen the chance …