Create a bsl::chrono::duration object having the bsl::ratio<3600, 1> duration period and initialized with the specified hrs number of hours.
bsl::chrono::duration
bsl::ratio<3600, 1>
hrs
Declared in <bslstl_chrono.h>
<bslstl_chrono.h>
constexpr std::chrono::hours operator""_h(unsigned long long hrs);