[time.duration.comparisons]

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template<class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);

Returns: CT(lhs).count() == CT(rhs).count().

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template<class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator<(const duration<Rep1, Period1>& lhs,
                           const duration<Rep2, Period2>& rhs);

Returns: CT(lhs).count() < CT(rhs).count().

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template<class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator>(const duration<Rep1, Period1>& lhs,
                           const duration<Rep2, Period2>& rhs);

Returns: rhs < lhs.

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template<class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator<=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);

Returns: !(rhs < lhs).

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template<class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator>=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);

Returns: !(lhs < rhs).

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template<class Rep1, class Period1, class Rep2, class Period2>
  requires three_way_comparable<typename CT::rep>
  constexpr auto operator<=>(const duration<Rep1, Period1>& lhs,
                             const duration<Rep2, Period2>& rhs);

Returns: CT(lhs).count() <=> CT(rhs).count().