1) 12-16 days after ovulation, if not bingo, then Miss M will come <<<< no matter your cycle is 30 or 47 days
2) if I were you, cycle is 47 days, start to use red D daily since day 10 (once per day, even 8pm is OK). Once there is "light line" on red D, then start to dodo once / 2 days. Why start on Day 10??? Since you never know how long this cycle will be. If the coming cycle is suddenly shorted to 3X days, you NEVER miss ovulation since u already check since day 10.
3) For normal case, the time you can use greed D: 14 days after last dodo or 12 days after "dark line" found red D.