2017+ FIAT 124 Spider General Discussion Forum
Yup, as with many things in the manual, vague hints... here's the content from page 26 of the 2017 version of the Abarth model owner's manual:
But, as you've noted, Dan provides the info on his site. 30 seconds by default, but also selectable to 60, 90, or 120 seconds.
But there's also a...