[jaibot]

What about person-years?

[alexbecker]

I find it unimaginable that more people are coding than are farming full-time (which is at least hundreds of millions). Given that agriculture is also older by >2 orders of magnitude, I think it's pretty safe to say it has more person-years behind it.

[mcfunley]

A lot of time has gone into farming in the last ten or twelve thousand years (source: nautil.us, ted.com)