There is really no specific time that is required for us to start investing in bitcoin. But if you want to start the best way on starting an investing with cryptocurrecy it is much better if will learn the basics and the ups and downs of the market of bitcoin which includes the changes on its price and its stocks which could indicates opportunity and better chance to earn in the future.
That's because the price is always changing. In fact, what you say if the most important thing to learn is the basics of cryptocurrency and investment. Thus we must be able to analyze the market and read the development of specific information, so as to make a fairly accurate prediction.
Whenever that is, make sure that you understand all the risks you should face if investing with bitcoin. Prepare carefully, do not panic easily and do not be influenced FUD.