If you ask when is the right time to invest then the right time for invesatsi is when the coin price has bad news so making the coin makes the price is down or collapsed it is the right time to buy!!!
Of course right time for buying is red market, when the price will be almost equal to nothing as compare to the high price, we are able to see how fast bitcoin is riding now a day, so I think we should buy right now, most of time people spread some bad news about bitcoin which often gets the price down but no need to be worry mate have patience I am sure you will earn high at the end, buy dont be late any more it is perfect and profit making time to buy bitcoin.