score:3
This really depends on where you live and how busy the Questura is.
You can register online for an appointment, then you must present in person.
An officer will scan your fingerprints and gather the required documents.
You can find a list of required documents here.
There's a fee of β¬ 42,50 plus a "Marca da Bollo" stamp of β¬ 73,50.
It will take about 2 weeks during non-busy periods. (personal experience)
Edit after comment:
Well then, looks like in Milan you can ask for urgent processing of your application only for health or work issues.
Immigration office seems separate from Passport office, that's good news.
Upvote:1
If you get the Italian Citizen, the total time is no more than 6 weeks (1 month and a half). So, I believe you will not spend more than that. I got this information from here.