so we probably are not alone. the next questions for me are: how rare is first "one-way" contact between intelligences? and how rare is asynchronous two-way con

so we probably are not alone. the next questions for me are: how rare is first "one-way" contact between intelligences? and how rare is asynchronous two-way contact (centuries or milllenia in between messages) and how rare is two way immediate contact in our galaxy?