As Alphabet's (GOOGL) Google navigates the fallout after firing an employee who authored a controversial memo alleging men are better suited for tech jobs, it's important to remember that Google is far from the only company facing bad headlines. In recent months, brands including Dunkin' Donuts (DNKN) , Chipotle (CMG) , Uber and United (UAL) have faced their fair share of public relations nightmares.

While responses to crisis differed, each instance begs the same question: How long does it take to restore an image? 

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