No wonder it took so long to upload to ArcGIS Online.
Thanks for the tip. I am guessing Pro tried to copy all the data in the project I was using to create the template. This seems silly as a default. I'm assuming it is the default setting, because I didn't change anything when I used the project to create a template. Anyway, regardless there is far less than 9GB of data that the project's layers are pointed at, so I'm still interested to know what might be causing it.
The link is here to examine what templates are...the section is quite extensive
https://pro.arcgis.com/en/pro-app/help/projects/what-is-a-project-template.htm
There is no such thing as an average template size.
I don't know where to start. I have some questions - what is the average size of a Pro template? What is a Pro template? The size makes me think it has packaged up all of the data, not just the list of data sources and how to symbolize it like a .MXD is. The thing is, all the data sources listed in the Pro template is way less than 9GB in size.
Perhaps you can provide so details
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