I am curious if anyone has more information on the actual logistics and timing behind the ancestral three year residency to citizenship path?

I have already obtained all of the necessary documentation, codice fisciale, visa, and a permesso di soggiorno as well as the form I need to fill out to ...

Here's the situation:

My great-grandfather: born Italian citizen 1900 - maintained lifelong citizenship
My grandfather: born Italian citizen 1936 ; naturalized to Canadian citizenship 1959 (unknowing of loss of Italian citizenship as dual citizen was not allowed at the time); regained Italian ...