Most approvals are for a 12 month period. Some approvals are for less time such as 3 or 6 months. Before a study may continue it must be renewed based on its approval period. If a study should expire, no further activity may occur on that study until it is renewed. Check with your WU researcher to ensure you know that approval period for the study you are conducting. It is the responsibility of the WU researcher to submit renewals to HRPO at least 6 weeks prior to expiration. Modifications may be made at the time of renewal.