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### Wait traits requirements

In the table below, `X` denotes a wait traits class for clock type `Clock`, where `Clock` meets the C++11 type requirements for a clock, and `d` denotes a value of type `Clock::duration`.

Table 41. WaitTraits requirements

expression | return type | assertion/note pre/post-condition
--- | --- | ---
`X::to_wait_duration(d);` | `Clock::duration` | Returns the maximum duration to be used for an individual, implementation-defined wait operation.