std::chrono::duration_values::min
From cppreference.com
                    
                                        
                    < cpp | chrono | duration values
                    
                                                            
                    |   static constexpr Rep min(); 
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Returns the lowest possible representation.
[edit] Parameters
(none)
[edit] Return value
returns std::numeric_limits<Rep>::lowest()
[edit] See also
|    [static] 
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   returns the special duration value min  (public static member function of std::chrono::duration) 
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|    [static] 
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   returns a zero-length representation  (public static member function)  | 
|    [static] 
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   returns the largest possible representation  (public static member function)  |