Can't increase sudo session

[Junayeed Ahnaf Nirjhor]

Hello,

I want to type in sudo password once and not worry about it for next 15 
mins, here's what I did (Drivers > line 11) : http://pastie.org/4090180

But it is not working, the sudo password is prompting nonetheless :( Any 
help?
-- 
Junayeed Ahnaf Nirjhor
Developer, Hulu <http://www.hulu.com/> & Diaspora 
<https://joindiaspora.com/>
Twitter - @Nirjhor <http://twitter.com/nirjhor>
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