code: public void setDurable(boolean isDurable)
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "setDurable", Boolean.valueOf(isDurable));
  
          durable = isDurable;
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "setDurable");
      }
docs: time for a durable subscription.