How many repetitions if a tricky passage is enough to get it securely into "muscle memory?"

Is two perfect repetitions in a row good enough? Is 5 better? 7? Is aiming for 10 just a waste of time and energy?

Research on "overlearning" provides some clues on how many repetitions might be "enough."

Adequate Learning Vs Overlearning: How Many Repetitions Is Enough?

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