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What is the cut-off for switching from quick sort to heap sort in the implementation of introsort?

What is the cut-off for switching from quick sort to heap sort in the implementation of introsort? Correct Answer 2 log (n)

Quicksort has a worst case time complexity of O(n2) which is not preferable. So in order to avoid worst case of quicksort, introsort switches to heap sort when the depth is greater than 2 log(n). This particular value has been deduced experimentally.

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