Well if we speak about gaining on bitcoin i think there is no required time on making an act of productivity.We can really buy bitcoin anytime anywhere without any hesitation and we really didnt have to be afraid about the price because dropping and pumping is really the nature of it and we really need to make sense of it so that we can become more productive and we don't feel like panic all times.
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.