How long will this laptop last?

It's a 2011 Lenovo T520, I bought it refurbished. I'm only expecting 2 to 3 years. What do you think?
Added (1). http://www.amazon.com/gp/product/B00Y13PBQA?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
Added (2). I got a really good deal + free extra RAM, so I didn't mind buying it.
Added (3). I will be using it for programming and music editing.

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