get_audio_duration.js

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch({
    args: [
      '--proxy-server=http://127.0.0.1:1087'
    ]
  });

  for (const url of process.argv.slice(2)) {
    const page = await browser.newPage();
    await page.goto(url, {waitUntil: 'networkidle0'});
    const duration = await page.$eval('#audioplayer', el => el.duration);
    console.log(duration);
  }

  await browser.close();
})();