A question arose on the Twitts, to whit, how many years of postdoc training are required before getting a faculty level job. I'll be flexible here, this is not just tenure track but let's keep it to academic science and a professorial type equivalent appointment. Something that lets you apply for research grant funding and is not explicitly "training" or temporary or whatnot.
I am most curious about the trends over time. So I want to break this down by the year you were first appointed. Answer the appropriate poll for your case please.