No one can say which is the best time to buy and store bitcoins but by having a closer look to the market graphs one can earn a large amount of money, as time of investment plays a very vital role in the cryptocurrency and their are many type of web pages available in the market but anyone can not relay fully on them they can only be use for reference not for surety and investment in bitcoin or any form of cryptocurrency is like playing a gamble sometime you gain profit and sometime you can lose some of your money so be very careful while investing.