Order transmittal occurs after you've retrieved your orders and before the pick list or packing slips are generated and transferred to the warehouse. This is the time required for transfer of order information. Your answer here should not be more than one day. It might even be less than an hour. However, if you have more than one warehouse, coordinating order transmittal can take longer.
Smaller businesses can sometimes combine order transmittal and order retrieval into one step.
Record this figure as X to X number of days. Remember you hope to have a high volume of orders, and a large number of items per order. Plan for success. If you have items that require additional time to box or prepare for shipment, specify this on your Web site to alert the customer to additional delivery time. And ask your warehouse staff if they have specifications about when or how many times a day they collect new pick lists.