As for the article, I am actually doing 1 - 2 min shikantaza regularly while working. I'm staring at an empty screen. I do it multiple times per hour regardless if I feel focused or not.
* Don't try to fix the posture while attempting shikantaza.
** Obviously something even more practical for a beginner is to gain focus by counting breaths and then breath awareness, before trying the most difficult type of zazen. I'm just describing what would be a way for someone that does not practice to imagine what correct shikantaza feels like.
In a good way :) like the present moment opening up into pure stillness/infinity - slightly different than sitting and having the thought pop up "It must be 20 minutes now" and then glancing at the incense to see its just the beginning :)
I personally wondered if the growth in general goodness over the last 100 years has been at least partly because some jobs, like driving, involve more practice at evenly suspended attention; good driving is at a surface level like sitting; maybe the uptick in general wickedness recently is because we are distrupting our evenly suspended attention thru networked addictive devices. Just idle speculation of course.