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My perspective is that you need to repeat something 17 times before you trigger your memory and know it automatically when asked.
7. Definitely 7.
The average person needs to hear something twenty times before they truly learn it. To make a word part of your vocabulary, you should use it as often as you can - look for ways to use it in conversations, write it down, look for it on a sign or listen for it in conversations around you. You don't have to actually count how many times you have used it, because then you are thinking about the number and not the word!
Some form of "learn" (-ed, -ing) appears almost seventy times in the King James translation.
Four times