Here’s How Long It Usually Takes Apple’s Share Price to Double by Philip Elmer-DeWitt @FortuneMagazine February 4, 2016, 8:34 AM EST E-mail Tweet Facebook Linkedin Share icons Forget, for a moment, Apple and Google’s see-saw battle for market cap bragging rights and consider this chart: The idea for it came from a long-term investor who bought Apple for $1 a share (split adjusted) in May 1998 and has watched it double many times over. The first doubling was the hardest. Getting from $1 to $2 took Apple more than six years, from 1998 to 2004. Get Data Sheet, Fortune’s technology newsletter. Since then, Apple’s share price has doubled on average every 22.6 months—and that includes the massive sell-offs of 2008 and 2012 when the stock doubled, fell back sharply, and then recovered. Apple aapl is currently trading within the $64-to-$128 range. It passed $128 in February 2015 before retreating below $100. For more on Apple, watch: Past performance is no guarantee of future results, of course. If it were, you might expect Apple to clear $128 by October 2016 and reach $256 two or three years later.