"Our favorite holding period is forever."
-- Warren Buffett

In the 1960s, the average holding period for a stock was approximately eight years. However, with the dramatic drop in trading fees and the ease of online trading, the holding period is currently estimated to be less than a week, and in some cases stocks are being held for mere seconds. 

This shift from investing long term to rapid trading really flies in the face of famed investor Warren Buffett's favorite holding period: forever. However, just because most of the market is trading, that doesn't mean that we have to follow this lead. With that, here are three stocks that we have zero plans of ever selling. 

Brian Feroldi: I'm a firm believer that the best companies to buy and hold for the long term are industry disrupters. One company that has been doing that for years is Amazon.com (NASDAQ:AMZN), and despite its already huge size, I think the company has plenty of runway left.

Amazon boasts several characteristics that make it an ideal core long-term holding. First and foremost, it has a top-notch management team; longtime CEO and founder Jeff Bezos has proven to be a terrific leader. Bezos has shown time and time again a willingness to forgo short-term profits in order to continue to make his business more and more consumer-friendly, which is one of the main reasons it is the retail powerhouse it is today. Better yet, Bezos is just 51 years old and he still owns more than 18% of the company, so he remains heavily invested in its success, and his age should allow him to lead it for many years.

Beyond its leadership, Amazon's business also offers nearly unlimited reinvestment opportunities and the company has spared no expense in building out its infrastructure in order to better serve its customers. Those investments allow it to serve those customers quickly and cheaply, which gives it a durable competitive advantage that its rivals will find tough to match.

And yet, despite all its past success and huge lead, Amazon remains a very controversial name in the investment world as its extreme willingness to reinvest in itself makes the company look unprofitable. I think that's a short-sighted view. I, for one, applaud its willingness to invest in making their platform better. 

I continue to believe that Amazon is still just getting started, so I can certainly see myself holding on to shares indefinitely. 

George Budwell: Although Warren Buffett won't be around forever, I personally have no plans to ever divest my Berkshire Hathaway (NYSE:BRK-B) Class B shares. Besides being a quick and easy way to diversify a portfolio through its various holdings, Berkshire is a great stock to own because it's one of the most financially solid companies in existence. And this noteworthy achievement is the direct result of Buffett's first rule of investing: Never lose money.
Instead of focusing on growing Berkshire's top line at breakneck speed by engaging in risky business activities, for example, Buffett and his colleagues have simply designed the company to be impervious to downturns in the market. To do so, they have placed a heavy emphasis on investing in large-cap companies with strong competitive positions and sustainable free cash flows.
The net result is that Berkshire now sports an eye-popping cash position and stellar positive cash flows. In the third quarter, for example, Berkshire reported having over $60 billion in cash and net cash flows from the first nine months of 2015 exceeding $24 billion.
The key issue to understand is that Berkshire's monstrous cash position has allowed it to be opportunistic during violent sell-offs in the market over the years. During the financial crisis of 2007 to 2008, for instance, Berkshire was able to use its cash reserves to strike favorable deals with a number of blue-chip companies, resulting in over $10 billion in profits in less than three years' time, according to The Wall Street Journal.
So, while Berkshire's stock may be struggling this year, I'm confident that it will eventually return to its market-beating ways due to the company's laser-like focus on the health of its balance sheet. 

Image source: Flickr user Jason Howie

Matt DiLallo: It has been roughly 20 years since Bill Gates declared that "content is king." And no company has taken his words to heart quite like The Walt Disney Company (NYSE:DIS), which has become a content powerhouse. It knows the value of creating a relatable character and then creating a mountain of valuable content -- such as films, music, or shows -- around that character. This content then flows out into other revenue streams such as its parks and consumer products that then flow copious amounts of revenue into Disney's coffers. So, with content being king and Disney the king of content, I cannot imagine selling this stock.
Disney does a great job of cashing in on its content, and it recently closed the the books on another very lucrative fiscal year. Revenue was up 7% to $52.5 billion while net income increased 12% to $8.4 billion and earnings grew by 15% to $4.90 per share, all three of which set new annual records. In addition to that, the company generated robust free cash flow totaling $6.6 billion, which it used to buy back stock and increase its dividend. Its dividend yield is just over 1%. 
Looking ahead, Disney's content-driven future looks brighter than ever. It has a slew of new Star Wars films and related content on the docket, including adding Star Wars-theme lands to its parks. This is complemented by content created by its Pixar and Marvel brands as well as Disney's own branded content. The company also plans to open its Shanghai Disney Resort next spring, which could open the doors for its content to reach a new frontier. 
Disney's rich history of success, combined with a compelling future built around exceptional content, makes its stock one that I don't ever plan to sell. 

Brian Feroldi owns shares of Amazon.com and Walt Disney. George Budwell owns shares of Berkshire Hathaway. Matt DiLallo owns shares of Amazon.com and Walt Disney and has the following options: long January 2017 $135 calls on Berkshire Hathaway, short January 2017 $145 calls on Berkshire Hathaway, and long January 2016 $57.5 calls on Walt Disney. The Motley Fool owns shares of and recommends Amazon.com, Berkshire Hathaway, and Walt Disney.

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