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Table 5 Average increase in cost per customer for selecting a delivery time window (1)

From: Using an integrated order picking-vehicle routing problem to study the impact of delivery time windows in e-commerce

Number of customers Geographical spread Time window width
  Clustered Random 2 h 4 h
50 4.06 4.72 6.6 2.18
100 2.40 3.54 4.55 1.38
150 1.84 2.85 3.61 1.08