... This is W5NOR ...
Whenever you hear the repeater transmit its callsign, in voice or code, take this as a hint that you should identify your own station. The timer is set for 9 minutes, so if you've been in a long QSO, you should have enough time to stay legal.
Also recall that the repeaters have blab-off timers. Should you talk too long without allowing the repeater to reset its timer, the transmitter will be shut off.
The repeater will signify that the timer is reset by sending the courtesy tone. If you "tailgate" and start talking between the time the other operator stops transmitting and before the courtesy tone sounds, the timer will not reset!