After awhile I was feeling the same and to shorten my workouts I did them like this:
Squat, bench press, bent row, dips
Squat, military press, deadlift, chins
Squats are the most important so do them every session, you dont want it too short so this is why I put some dips and chins in.
It was good for awhile but I now much prefer to follow the ptc routine since I have come back from a break.
My advice would be to listen to others, if you are eating and resting enough, you shouldn't be getting tried, I'm eating better than I was and not getting tired now, feel great during and after the session!