I wasn't suggesting you should do HIIT at work (although we used to take an hour gym breaks during lunch at my previous office since we had a gym next door to the office), but rather do 10 mins of exercise at home and get more benefits while saving 20 mins of time.

I mean if you're chatting with coworkers and relaxing during the walk then it's a different story - but if you're just in to it for health benefits - like I've seen people suggest walking home from work, etc. - just take the shorter route and do proper exercise.