Next.js staticPageGenerationTimeout not working

Question

I have put this in my next.config.js file (Next.js 11.1.3):

const path = require("path");

module.exports = {
   sassOptions: {
      includePaths: [path.join(__dirname, "styles")],
   },
   trailingSlash: true,
   staticPageGenerationTimeout: 1000,
};

However, the error I get is this:

warn  - Restarted collecting page data for /blog/[slug] because it took more than 60 seconds
warn  - See more info here https://nextjs.org/docs/messages/static-page-generation-timeout

It's mentioning 60 seconds which is the default value and seems like the custom value I've provided isn't working. What's wrong?