I’d say the average is ~5 years from first commits to wide-spread adoption. Git was introduced in 2005, and didn’t really break out in a big way until 2010-2012. Linux was early 90s, and didn’t really break out until the dot-com era. First web browser, HTTP and HTML was 1990. First real breakout was about 1995. 

So if you’re seeing exponential adoption curves <5 years into a new protocol and/or new open source technology, you’re doing pretty great!