What is Dwell Time? Does Google Consider this as A Ranking Factor

What is Dwell Time? Does Google Consider this as a Ranking Factor? Is it REALLY a ranking factor? And if so, how can you optimize dwell time? The concept of dwell time was first introduced 3 years ago by Duane Forrester at Bing. Google started to penalize mobile sites that contain intrusive pop-up ads and this has been officially announced in 2017. If you remove ads, then certainly your dwell time will improve a lot. You will have to decrease the bounce rate and increase time on page to increase dwell time.