std::chrono::duration<Rep,Period>::min
From cppreference.com
                    
                                        
                    
                    
                                                            
                    static constexpr duration min();  | 
(until C++20) | |
|   static constexpr duration min() noexcept;  | 
(since C++20) | |
Returns a duration with the lowest possible value.
If the representation rep of the duration requires some other implementation to return a minimum-length duration, std::chrono::duration_values can be specialized to return the desired value.
Parameters
(none)
Return value
duration(std::chrono::duration_values<rep>::min())
See also
|    [static]  | 
  returns the special duration value zero  (public static member function)  | 
|    [static]  | 
  returns the special duration value max  (public static member function)  |