Some day in the future, you will realize that the best time to invest was not today, but some other day in the future, when prices were low. But with the information that you have today, the best time to invest is still today, because you do not know when prices will be low, and you do know that the longer you hold your investment, the more time it has to grow.
Toughts?
I think there is no specific time when we talk about investment. Every time is the best time to invest. Why? Come to think of it, for those who invested their money way back nineteen years ago, they don't even know that their investment is now a success that even themselves can't believe that in the near future it will become a source of wealth they are experiencing right now. So start investing right now for it is the right time before its too late. We never recover the time wasted, never.