If you had to quantify that into a single number that represented your years of dev experience (e.g. on a job application), how would you come up with that number?
so, i been in the industry prob almost 30 years now.
if someone asks me how many years of 'x' (html/js/java/sql/unix/etc.), i might say anywhere from 5 to 30, depending on what i'm feeling like.
if they ask about shell scripting, something i did about 1 hour per month, on average, for 7 of the last 30 years, the answer is 5 years.
just make stuff up.
i try to go with reasonable numbers, because they are really just a proxy for "How good at you at 'x' on a 1-10 scale?"
and you could go into some long, boring explanation about, "Well i used to know Big-O really well 10 years ago, but it's been a while and...."
people are sleeping already. just give them a number. they have to put a number on their sheet - give them a number.
imo. :)