docs: @Override
      public long getHiddenExpiryTime()
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
          {
              SibTr.entry(tc, "getHiddenExpiryTime");
          }
  
          long hiddenExpiryTime =
                          getMessageItem().getHiddenExpiryTime();
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
          {
              SibTr.exit(tc, "getHiddenExpiryTime", Long.valueOf(hiddenExpiryTime));
          }
          return hiddenExpiryTime;
      }