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Run the
          io_context
          object's event processing loop for a specified duration to execute at most
          one handler.
        
template<
    typename Rep,
    typename Period>
std::size_t run_one_for(
    const chrono::duration< Rep, Period > & rel_time);
          The run_one_for() function blocks until one handler has been
          dispatched, until the io_context
          has been stopped, or until the specified duration has elapsed.
        
The duration for which the call may block.
The number of handlers that were executed.