std::chrono::duration::max
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   static constexpr duration max();  | 
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Returns a duration with the largest possible value.
If the representation rep of the duration requires some other implementation to return a maximum-length duration, std::chrono::duration_values can be specialized to return the desired value.
[edit] Parameters
(none)
[edit] Return value
returns std::chrono::duration(std::chrono::duration_values<rep>::max())
[edit] See also
|    [static]  | 
   returns the special duration value zero  (public static member function)  | 
|    [static]  | 
   returns the special duration value min  (public static member function)  |