Liverpool St to STN.
Timetabled at 45 to 55 minutes. Trains every 15 mins most of the day.
Single fare £21.
(And if you want to have fun, google the fare to Audley End and "permitted routes"...)
Liverpool St to SEN
Timetabled at 50 to 55 minutes. Trains every 10 to 20 minutes during daytime, more in rush hour, less in quieter times.
Single fare £14.30