it may be worth noting how long we invest in bitcoins, because the longer we invest in bitcoins, the more likely we will make big profits.
If you will be talking about how long we invested in Bitcoin, we must also add that it depends when we will be selling those Bitcoins. Bitcoin is known for being a unpredictable digital currency because of its volatility, that means investors might have a hard time when to sell their Bitcoins since whenever the price pumps, it will either dump or pump more though we do not know when.
Very complicated situation. The time of the investment is important. Yet the amount of investment is also important. When you combine both, you can see that the result will be linked to your prepareness about the market.