There doesn't seem to be an option for this. However, there is a 
Greasemonkey plugin that does this for Firefox.

http://userscripts.org/scripts/show/97613

Someone should port the script for TamperMonkey so I can use it with Chrome 
also.

Babbers

On Friday, 8 February 2013 12:31:57 UTC-8, Zack Tennant wrote:
>
>
> http://support.google.com/mail/bin/static.py?hl=en&page=checklist.cs&tab=29495
>
> The help pages are generally pretty good for this stuff.  Once in a while 
> they have old/incorrect information, but usually it's good.
>
>
> On Fri, Feb 8, 2013 at 10:29 AM, Surekha Shyam 
> <[email protected]<javascript:>
> > wrote:
>
>> How and from where to turn on this feature?
>>
>> *Step two, turn on two-factor authentication, then even if still "logged 
>> in" they won't be able to get in without his authentication*
>>
>> On Fri, Feb 8, 2013 at 6:01 AM, Zack (Doc) <[email protected] 
>> <javascript:>>wrote:
>>
>>> Step one, don't click the little box on the main login page that says 
>>> "Stay logged in" or something to that effect.
>>>
>>> Step two, turn on two-factor authentication, then even if still "logged 
>>> in" they won't be able to get in without his authentication.
>>>
>>> Step three, click the details at the bottom right, and it will show you 
>>> where you've logged in from, and where you're currently logged in from. 
>>>  Click to close all other connections.
>>>  
>>>
>>> On Thu, Feb 7, 2013 at 3:34 PM, APB <[email protected] <javascript:>>wrote:
>>>
>>>> A friend travels frequently, so uses unsecured connections, and often 
>>>> uses his Gmail on clients' computers also.  He asked me if there was some 
>>>> setting which would log him out of Gmail after a set amount of time, if he 
>>>> forgets to log off himself.
>>>>
>>>> I am not aware of such a thing, but perhaps there is an add-on?
>>>>
>>>> TIA, APB
>>>>
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