Detailed Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Problem:Context: The coalition total was reduced to 64 seats when Rob Oakeshott, former state Nationals turned independent MP, won the seat of Lyne at the September 2008 Lyne by-election, resulting from the resignation of former Howard minister and Nationals leader Mark Vaile. Link Information: August 2008 Oakeshott resigned from the NSW parliament to stand as an independent candidate at the federal by-election for Lyne Question: How long had Mark Vaile held his post before resigning in 2008?
Solution:
Answer: 5