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How much could your portfolio be worth over the long term? If you invest $250 monthly into the SPDR S&P 500 ETF, you can be confident that your investment will grow significantly over the long term.

How much could your portfolio be worth over the long term? If you invest $250 monthly into the SPDR S&P 500 ETF, you can be confident that your investment will grow significantly over the long term.

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Below, however, I'll show you how a $250-per-month investment in a top exchange-traded fund (ETF) can grow over a period of 10, 20, and 30 years. Image source: Getty Images.