Recommending someone to invest in Bitcoin is some how risky. If the don't have the patience to wait for the bull season to commence the might sell at a loss and but the blame on the introducer. And many likes attributing their failures to someone then their success to their personal effort. I have learnt from past experience that before I recommend Bitcoin to a newbie I will first ask how long the can hold for and that will determine if I will be willing to proceed with guidance or end it there.
It is never an option to tell someone to buy bitcoin if they are a newbie and have no knowledge about what bitcoin is and what it does. If they know the fundamental of bitcoin and its usage, then they will obviously HODL till its value is high enough to give them the profit.
Don't ask them how long they can HODL. Instead teach them the basic of Bitcoin.