What rule does the title refer to? The body of the text doesn't even contain the word "rule" (all 7 to 11 sentences depending on how you slice it)
Like, what I learned in engineering, that there are 86,400 seconds a day and you can use 100,000 instead for estimation. E.g. when you have around 10 requests per second in a web service, each taking 1KB, then the traffic the web service generates a day is 1GB (== 10 * 100,000 * 1,000).
I only complained about it being 'weak sauce' because I felt you could have taken more time to develop this concept for the interested reader (which you do successfully in multiple other posts). 'Do more with less' is great advice, but 4 words don't necessarily constitute a complete essay :)