How much time would I take to read a web page?

estimate-reading-time.js

// output is in minutes
document.body.innerText.split(' ')
.filter((split) => split.length > 1)
.map((split) => split.replace(/[^a-zZ-a]+/g, ''))
.filter((split) => split.length > 1)
.reduce((acc, split) => {
  const time = split.split('').length * 115
  return [...acc, (time > 500) ? time : 500]
}, [])
.reduce((acc, time) => ([acc[0] + time]), [0])
.map((time) => (time / 1000 / 60))

// instead of using document.body, you can select only the main content of your page