This review should be long enough to see your whole facility, go through all your processes, understand your basic organizational needs. It warrants a comprehensive report and project plan and even, if appropriate, a closing presentation with senior management. In smaller organizations this could be completed in a day. In most organizations a two day review should be sufficient. Larger and more complex organizations may warrant more time. Obviously the more time you are willing to invest, the more advice and suggestions you will receive and the more correct the solution determined.
Cavendish Scott has been providing gap analysis auditing, along with project plans and meaningful solutions for 30 years. Contact us for more information.