Consider the Gantt chart shown below where the time scale is in minutes and all activities are performed on an early start basis. How much slack is available in The Great Hair Washing project? 
Definitions:
Periodic Review
A systematic evaluation of a process or system at regular intervals to ensure it meets certain standards or goals.
Safety Inventory
Additional inventory kept to protect against variability in demand or supply, ensuring that stockouts are minimized.
Cycle Service Level
A measure of a company's ability to deliver products to customers within the committed time frame, often used as an indication of inventory management effectiveness.
Fill Rate
The percentage of customer demand that is met without backorders or stockouts, reflecting a company's ability to satisfy orders with available inventory.
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