Re: 4.1? Should be at least 5.0.
Based on those dates, it would be far more accurate to say every 3.5 to 4 years, though I suspect that the sample size is too small to account for the Linus factor
True, and my math was off because I was just about to go to sleep, so brain already in powersave mode.
That said, the pace probably will pick up somewhat. Kernel 2.0 was around the mid 90's, 2.2 came out around 1998~99, 2.4 in 2001 and 2.6 in 2003.
We then jumped to 3.0 in 2011 which was the next major release, and represented a change in the version numbering scheme.
The pace is accelerating, and so while it was longer than what I had calculated earlier, it probably will get here sooner than the last major revision did especially as more resources are poured into the project.