How many days did Chris Hemsworth fast for: Unpacking the Limitless Challenge
                                
                                
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                                    4 min read                                
                            
                                For his National Geographic series *Limitless*, Chris Hemsworth underwent a four-day, water-only fast under medical supervision. This extreme challenge was part of a larger experiment to explore the science of longevity and cellular repair, revealing exactly how many days did Chris Hemsworth fast for in his quest for optimal health.