most people don't do what Buffett does, which is primarily buy into good, solid companies and then sit on his butt
"All intelligent investing is value investing - to acquire more than you are paying for. Investing is where you find a few great companies and then sit on your ass. - Charlie Munger at Berkshire Hathaway's 2000 Shareholder Meeting
99% of Long-Term Investing Is Doing Nothing
My Investment Advice: Do Nothing!
[see also time horizon: long-term vs. short-term thinking]