Gmail's sign in page offers the checkbox stay signed in. Does this mean that it will stay signed in indefinitely? If not, then for how long?The need help? link is not immediately helpful.
What does Gmail really mean when the login page offers me an option to stay signed in?
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Nothing lasts forever. You stay signed in as long you don't clear your browser cookies or manually sign out. If you use any third party junk cleaner tools like CCleaner to clear browser cookies, that will get you signed out as well.Gmail's session cookies have a relatively long expiration date as you can see here:This is discussed in Google's official blog where they've mentioned the following:In the coming months, Google will start issuing our users cookies that will be set to auto-expire after 2 years, while auto-renewing the cookies of active users during this time period.