If you have a Google Slides presentation that you would like to Auto-advance at a time other than Google's defaults, simply change the number at the end of the published presentation.
In the example below I will be publishing the presentation to every 3 seconds (default) to every 20 seconds.
- File - Publish to the Web
- Select Publish
- Copy the Url
- Change the ending number from 3000 (3 seconds) to 20000 (20 seconds)
https://docs.google.com/presentation/d/e/2PACX-1vT3jfvTEa2pcYJk5Z9PmhsK5NEfJRsbUXYXgT vMYm7oSZsFOqzZQ_4fpR6x-mj8wN0MRmzyfLMDF1ZL/pub? start=false&loop=false&delayms= 3000 3000 CHANGE TO 20000
Thank you to my friend Layla Lyons for telling me about this trick!
Embedded below is a 1 minute YouTube tutorial.