How long will Britain stay in the EU?

How long will Britain stay in the EU? Cameron’s veto at the EU summit was the moment Britain signalled the beginning of a long goodbye to Europe, which also bid its farewell to Britain
http://link.ft.com/r/XYEWFF/97E2NV/HDKQA6/PFPQHV/1658KK/JY/h?a1=2011&a2=12&a3=9