The Day/Time you set are the day and time range that the customer is allowed to choose as a pickup/delivery time for their order.
To Add a day and time range.
Select the Add+
Select the Day of week to add
Select Add Hours
After you have added, drag the begin time and end time to the start and end hours that you want to set for that day. Check the box next to the Menu you want to have these hours set.
After you have made all of your changes, be sure to click the Save Changes.