That never happened since 2011. Consider also investing for at least a year or two: in such case you have a 99,9% chance to be in a big fat profit. Wishing to buy BTC and get rich quick is a huge gamble. Or if you are not interested in holding BTC at all and only buy it to access certain markets (e.g. where CC do not work), then it's stable enough on an hourly basis. You'd waste more money on exchange fees anyway.