The lead time is a static value, which you set in your order settings ⚙️➡️E-Commerce ➡️ Order Settings under "Default Lead Time". Enter the number of days to represent your lead time. This lead time uses consecutive days and does not account for weekends or holidays. For example if your lead time is 10 working days, you'd want to enter 14 to account for the two weekends.
This will set the ship date on orders (ordered date + default lead time). On each order, you can manually change the actual ship date in the sidebar if needed.
You can also set a lead time for each production line.