The build-X-in-low-Y-minutes trope implies that something is trivial to implement (usually by importing middleware that does the heavy lifting). A 30 line class is not trivial.

> The build-X-in-low-Y-minutes trope implies that something is trivial to implement

I think it just implies that the reader can do it without prior knowledge, and that Y minutes is surprisingly small.

You wouldn't write "build a blog in 80,000 minutes" even if it could be done with one line of code. And you wouldn't write "build [complicated thing] 3 minutes" and then show an expert rapidly typing a pre-determined program into an editor.

If a newbie can do it in Y minutes following the tutorial, it seems valid to me.

I'll agree the "surprisingly small" interpretation is more charitable.

> implies that something is trivial to implement

I don't think it does. It shows something implemented quickly, suggesting that it's a tutorial you can sit down and follow in one go.

Build implies something other than cut-paste or git clone ./make

This title is misleading.

Install a chap app in 8 minutes would be more appropriate, although really it's just sensationalism.