A read-only CwrUpdateTime, in seconds since power-up, recording when this 1-hour subscriber-unit statistics row was last refreshed. It confirms the accompanying hourly codeword, power, and error statistics reflect a genuinely completed or current operational hour rather than stale data from an earlier period. For example, an admin building an hourly performance report would first check p2mpSu1HrUpdateTime to confirm the row being read corresponds to the hour they intend to report on.