In the stock market the longer you hold your stock the more you lose or gain?

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Hi im just starting to learn about the stock market and how it works so i have a question say if you buy your stock at $100 each so you buy 10 = $1000. Then it goes down in value by 10% = $900. Lets say it stays like that for the next week, would i lose any more money other then the $100 over the next week with it just sitting there? And then if it goes up by 20% = $1100. Is that right ? or is there a tax or something ? Because if it is right could you just leave your stock alone for years and maybe in 5 or so years sell it for a good price ? Thanks any answers would help :)

In the stock market the longer you hold your stock the more you lose or gain?