The challenge will be I think is to keep your money in bitcoin for that long. For sure you will see the growth your money will have and you will be tempted to take it out but patience shall pay off.
If you get used to holding, it won't be a challenge anymore. Once you've been holding for several months to years, and you're seeing your money grow then it is for you to decide that things coming to the market are normal things. Even the toughest news that makes the price of BTC plummet and nosedive, you won't be affected by it a lot.
Your money will be in more danger if you take it out. You might take it out at the wrong time, wrong price and you could never buy again in the original price you bought it for. This is why long term investment is a less risky option for investment
Upon holding and you're in profit, that's when you take it out. You decide for how long you're going to hold. And those that sells at a wrong time and moment, they're mostly the panic sellers.