Hi Alan,
I would suggest instead of having 6 routes that cover multiple days you do the following.
Break your routes up in the VRP by day. An example of this would be Truck1_Monday, Truck2_Monday, Truck1_Tuesday, Truck2_Tuesday. This will help break up your days while still allowing you to assign orders to the same inspector. So if you have 6 inpsectors visiting orders over 3 days you would 18 individual routes. You can then string these together. This will also help increase the processing performance of 55K orders.
Cheers,
Scott