on a full body workout do you just do 2 sets of 2 excersises per muscle group?

so i started not too long ago and this week i started doing lower/upper/full body and today is my first fb workout so i wanna know if you are supposed to do 2 sets of 2 excersises per muscle group since doing the normal (3 sets 3 excersises) would take like 3 hours

so for example

back: 2 sets of lat pulldown and 2 sets of setaed cable rows

chest: 2 sets of bench press and 2 of chest press

legs: 2 leg press 2 leg extensions

etc

is this correct?