I'd argue you need between 6 minutes and 6 years.

It depends entirely on what you want. You can literally code a JavaScript 1-liner that will make a <textarea> then put the content back in the URL and it will work serverless on pretty much any platform with a Web browser.

You can also write a note taking app that will be federated yet private, that will have its own scripting language, etc. I mean you can yak-shave your way to write your own OS or even designing your own CPU for that.

So... I'm not sure that metric, time, means much without a proper context, including who does it. It's quite different if to do that, regardless of the tooling used, if you are a professional developer, designer, fullstack dev, prototypist, PM, marketer, writer, etc.