Describe the procedure for conducting a Hold Time Study.

First, prepare and approve a study protocol. Identify the material, proposed holding period, storage conditions, sampling intervals, tests, and acceptance criteria. Collect samples at time zero and predetermined intervals, perform the required tests, evaluate the results, investigate unexpected findings, and prepare a report. QA/Validation reviews the results and ensures that the justified holding time is appropriately approved and implemented.

Present the procedure in sequence: protocol, storage, sampling, testing, evaluation, reporting, and approval.