the Total Unloading Time (TUT) per SKU (Stock Keeping Unit): it represents the total average time requests to unload a pallet incoming; the simulation model allows to estimate values for the LSP (TUTLSP) and the retailer (TUTRet). It is the sum of a fixed unitary technical cycle time for unloading a palletized SKU and a delay time, which could vary, as empty pallets are not available for deliveries. This last contribution is scenario dependent as its values depend on the specific interchange scenario applied;