The minister mentioned 7 years I think. 
Lessons for investors
Properly applying
Buffett's wisdom has the potential to improve any investor's
results. Retaining a long-term investment horizon, staying fully
invested, being patient while searching for opportunities, ignoring
short-term market fluctuations, and buying and holding stocks until
their prospects fade are all solid directives.
Buffett :
I don't like to sell. We buy
everything with the idea that we will hold them forever... That's
the kind of shareholder I want with me in Berkshire. I've never had
a target price or a target holding period on a stock. And I have
enormous reluctance to sell our wholly owned businesses under
almost any circumstances."
"Up until a few years ago, we sold things to buy more because I ran
out of money. I had more ideas than money. Now I have more money
than ideas."