I am not sure what you mean by a "reliable recipe." Ultimate results depends on paper and how much depends on dilution, time, freshness, and temperature. You can tone as little or as much as you want.
I use Kodak Selenium toner at 1:5 and 1:20. I found 1:40 way too slow.
My papers are various types of Ilford and Adorama house brand.
With 1:5, I watch very closely from the moment paper hits the solution. With 1:20, I see no obvious change for 2 minutes or so then it really starts to take off at around 4 minutes mark. Which dilution I use depends on how far I plan to tone and how much control I need.
Does that help at all?