A distribution system comprises 2 central distribution centers (which are both replenished from a single plant), 8 regional warehouses, and 56 stores. The replenishment lead times are as follows: plant (2 weeks), DC (1 week), regional warehouse (1 week), store (1 week). What is the minimum planning horizon?

5 weeks.

Explanation:

The replenishment lead times are 2 weeks for the plant, 1 week for the DC,! week for the regional warehouse and 1 week for the store.

The planning horizon is the amount of time that will be required by an organization when the organization is preparing for a strategic plan.

So the minimum planning horizon is 5 weeks.