Dwell Time
Dwell time is the time that passes from a user clicking a search result until that user returns to the search results. A short dwell time signals that the page did not deliver what the user was looking for, while a long one suggests the opposite. The concept sits close to bounce rate and time on page, but belongs specifically to search: the clock starts at the click in Google and stops at the return click to the SERP.
Is dwell time a ranking factor?
Google has never confirmed dwell time as a ranking factor, though documents from the US antitrust case against Google showed that click behavior feeds systems such as NavBoost. The direction is hard to misread: clicks that end in satisfied users help visibility over time, and fast return clicks pull the other way.
The boundary: dwell time cannot be read anywhere
A common misconception is that dwell time appears in an analytics tool. It does not. Only Google knows the interval between click and return click, because measuring it requires access to the search result itself; time on page and engagement rate are neighbors to the concept, not synonyms. What moves the number is the same thing that moves most user signals in SEO: the match with search intent, plus load time and structure rather than the length of the text. The neighboring metric, and what can actually be done about it, sits in the guide to bounce rate.