Waiting to long to get your PIN and/or not planning ahead means you will need to wait until your advisor is available.  You should also not expect them to be available for a meeting for a registration PIN if you just stop by the office.  Make an appointment ahead of time, particularly if you are concerned about registration.

If you have an urgent issue other than your PIN, you can stop by the Biology Program Office in Cordley 3029 or call 541-737-2993, but the office will not schedule appointments. It is often most effective to email quick inquiries to your advisor, and if you are clear in your advising meeting request they can work to fit you in quickly or contact you about your concerns.