An Endless Aisles package's time in transit is anywhere from 1-3 days on normal business days, depending on how far the customer is from our 2 warehouses in Cranburry, NJ and Las Vegas, NV.
Although FedEx delivers on Saturday, they do not on Sunday. Therefore, if an order is picked up on Sunday, it will have another day in transit before it reaches its destination. This will be reflected in the tracking number that your customer receives after an order.
Attached is the time in transit spreadsheet with zip codes.