Transit Time in Calendar Days?

Hello,

For quite a long time, I thought in transportation and delivery scheduling the TRANSIT TIME is measured in Calendar Days, which means weekends and public holidays are also included. For example, if the delivery date is 2007-12-31, and transit time is 8 days, the system will calculate Loading Date as 2007-12-31 minus 8, which is 2007-12-23.

But a few days ago, I found my understanding is not correct. It seems the TRANSIT TIME is also measured in work days, in the route factory calendar (not the shipping point factory calendar). In this case, the loading date in above example will be calculated as 2007-12-19, for a typical calendar.

Can someone confirmed this?

Regards, Ke