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