When should we expect the market decline to begin? Martin says that it’s impossible to say, though added that it may have already started with the big decline in Thursday’s trading session. In any case, Martin says it’s safe to assume that “the decline will start in the next month or two, if not sooner.”
https://www.marketwatch.com/story/get-ready-for-an-8-to-13-stock-market-correction-2018-10-04
https://www.marketwatch.com/story/get-ready-for-an-8-to-13-stock-market-correction-2018-10-04