Flickr Home Page: https://www.flickr.com/photos/alanklein2000/albums
Here's Howard Bond's article. https://www.willwilson.com/articles/...ciprocity2.pdf
Some of the results are likely outdated, but methodology, etc. are still valid.
You can use these as starting times for Kodak materials (I find they are close with TMY and 320Tri-X out to 20+ minutes).
For Ilford, use the data that Michael R links to and make yourself a chart.
Best,
Doremus
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