Hydra-reported build duration for some packages is not believable

For example, for chromium on x86_64-linux, it looks like hydra is saying that the builds take 1-2 seconds. But this… cannot be true, right? What gives?

https://hydra.nixos.org/job/nixpkgs/trunk/chromium.x86_64-linux#tabs-charts

My guess is that chromium is a wrapped package, which is “built” very
fast. If you look at the Build dependencies
tab
you can
see that chromium-88.0.4324.96 depends on
chromium-unwrapped-88.0.4324.96, which should take much longer to
build. Unfortunately the links on that tab are broken and direct to an
entirely different build, so no easy way to find out how long chromium
does take to build…

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