I will be taking the train from Naples to Rome airport that stops in Rome where I transfer to get on train to FCO.
The time stated on the transfer time is 10 minutes. I assume that is possible or am I reading it wrong?

It's possible but you're going to need to move. The FCO is in a different part of the station.

Have you booked this all together? If not just book Naples to Rome and buy the express train for the airport once you get to Termini.

Thanks. That sounds less stressful, which is what I like.

Why are you using a re-seller site? The minimum transfer time at Roma Termini on trenitalia.com/en.html is 15 minutes, somebody is selling you a non-protected connection.

Buying the ticket for the airport train at Termini makes no sense: With a little luck, you could make the transfer in 15 minutes (or even in 10). If not, the Leonardo Express tickets can be used on the picked train and on any Leonardo Express departing within the next 90 minutes.

The Airport trains have been using tracks 23 and 24 at Termini since since 2010.

There are high speed trains from Naples to Rome several times an hour, all day long.
and Leonardo Express trains to FCO every 15 to 20minutes all day long.

Simply pick the times for each leg that work best for you, and as noted above the ticket to FCO can be used on any train within the next 90min after the one you booked.

And nowhere did the original poster say they were using a reseller. Trenitalia themselves shows a 10minute connection....so somebody is giving your incorrect info....

Which is the destination. The OP will be getting off a high speed train most likely. From memory that means leaving that secure area. Heading down the hall to the other security gate and to those tracks. Easy enough for somebody not familiar with Termini to get lost. Yes there are signs but I'd still say the OP needs to hurry up and not stop and browse.

Buying the combined ticket also forces the OP to use TrenItalia from Naples. That may be the best choice but they could find the Italo schedule or price better.

I don't know what you mean with "secure area", the platforms are all side-by-side in the tracks area in front of the shopping center. Trenitalia's and Italotreno's High speed trains from southern Italy use tracks 2-12, i.e. Around 200 meters away from the tracks 23 and 24 used by the Leonardo Express.

As you can see from this map, it's quite an easy walk: https://it.maps-rome.com/maps-roma-t...stazione-mappa

Tracks 1-Est and 2-Est are hidden on the East side of Termini, but neither the Leo Express nor the high speed trains use them.

You are right, I doubt they have lowered to 10 minutes the minimum transfer Time at Termini: I must have been mistaken Roma Termini for Milano Centrale.

I don't know what you mean with "secure area", the platforms are all side-by-side in the tracks area in front of the shopping center.

Both Trenitalia's and Italotreno's High speed trains from southern Italy use tracks 2-12, i.e. Around 200 meters away from the tracks 23 and 24 used by the Leonardo Express.

As you can see from this map, it's quite an easy walk: https://it.maps-rome.com/maps-roma-t...stazione-mappa

You may be thinking at the old Tracks called 1-Est and 2-Est that are hidden on the East side of Termini, but neither the Leo Express nor the high speed trains use them.

True, but using Trenitalia all the way from Naples to FCO is the only way to have a protected connection. The airport train is not cheap at 14 € per person.

You are right, I doubt they have lowered to 10 minutes the minimum transfer Time at Termini: I must have mistaken Roma Termini for Milano Centrale.