Comment by glenstein
Unfortunately that's not the source. The author of this piece, Jaro Fietz aka oberien, is already familiar with that article, noting it in their diagram and linking to it toward the bottom of the page. They're looking for the underlying research itself rather than a quote about it.
>So in the end, where do the 23 minutes and 15 seconds come from? They are mentioned in interviews multiple times by Gloria Mark. But I wasn’t able to find a primary printed source. There are many more publications by Gloria Mark, but none of them turned up while searching for the 23 minutes 15 seconds figure. If someone knows a paper or study where that figure originally appears in, please tell me.
The mystery seems pretty much "solved" to me.
We know where that number originated from, it's from this Gallup interview with Gloria Mark.
We also know the Gloria Mark paper corroborates the number:
> When people did resume work on the same day, it took an average length of time of 25 min. 26 sec (sd=54 min. 48 sec.).
From the Gloria Mark paper: https://ics.uci.edu/~gmark/CHI2005.pdf
Now we're only left guessing the discrepancy between her paper saying 25 minutes and 26 seconds and her quoting 23 minutes and 15 seconds when interviewed about it.
My guess is she didn't recall exactly and gave a ballpark as she remembered it.