The order is not complete until the project has been uploaded. Once the order form is complete the editor will show the option to 'Upload Finished pages'.
The software then has 2 significant steps it completes. It needs to create the order data for your product and then upload it.

During the 'Creating the order data' step, your images will be resized to create the best sized file possible to upload, while retaining as much detail in them as possible.
This is a very CPU intensive process and on older computers it can take a long time (over 20 minutes for larger albums). On a modern mutli-core processor this can take less than 5 minutes.

The time it takes to create the order data and also upload the project is directly related to the size of your product, the number of pages and photos included, the resolution of your photos, the number of effects used, and specifically for the upload time, the speed of your internet connection.

You can click on the 'Test' button if you want the editor to check the page sizes and the internet speed to give you an indication of how long it will take to upload the project. The time will be displayed next to 'Upload Finished Pages'.

The editor will upload your project a page at a time, so if there are any interruptions to your internet connection, the editor will be able to pick up after the last successfully uploaded page after selecting 'Retry'.