the trains leaving on minute 41 need only 46 minutes without transfer (not every hour)
the trains leaving on minute 04 need 53 minutes without transfer (not every hour)
the trains leaving on minute 22 need 1 hours 5 minutes but need a transfer in Roma Ostiense.
The best is to check directly with the Italian State Railways
as boarding station and
Roma S. Pietro (exact spelling required - otherwise the system will not find the station!)
as destination station.
Have a nice trip.