Flying into Rome with a connection to Naples

Immigration/passport control in Roma.

Sounds a bit tight to me but doable if your first flight is on time.

Seems tight to me, given that you have to clear Schengen immigration in Rome. Assuming you are looking at the 9:45 Alitalia flight to Naples, you'll have to wait until 2:30 pm for the next flight if you miss it. If you are connecting to the 2:30 pm flight, the next one is at 5:50 pm. You do customs in Naples, which is just walking out the green "Nothing to Declare" door.

This site will give you a better idea of the time it takes.
Fill in the arrival/departure info then check the map.

I too think the connection is way too tight. Rule of thumb is 2-3 hrs for connection at arrival airport. Unless you're lucky 😗

Edit: sorry forgot to post the link.

http://www.ifly.com/rome-leonardo-da-vinci-airport/terminal-map

Are you making a connection on a single booking, or connecting/transferring to a separately booked flight?

Do you have checked baggage?

If you have two bookings, I think you could be in deep doo-doo.

Otherwise its possible as long as everything 'works per plan'