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"Keep Me Signed In" Checkbox
When you Sign-In to Amazon.com, you can stay signed in by checking the "Keep me signed in" or "Keep me signed in for future purchases" box on the Sign-In page. This will keep you signed in to your account for two weeks, or until you attempt to perform a sensitive action such as modifying account information.
To prevent others from accessing your Amazon account, we strongly recommend you don't use this feature on devices and computers that are shared with other people.