No investment guarantees instant profit, there are many processes and things that must be learned again in order to achieve the desired investment success target.
Whatever the investment instrument, there is always a small or big risk. So before starting make sure you understand the characteristics, risks and profit.
This is definitely true, there's no investment that guarantees instant profit especially if this characteristics is what you're looking up to cryptocurrency, the volatility of the market would still be the top concern. In my case, I would prefer to take profit out of my investment when the price of my principal amount were double already or depend on my desired amount. Also, some factors are depend on other necessities or emergency needs. But as long as I can be able to hold it for a long term I would choose to hodl it for a quite long while.