Hello,
This is what I have always recommended for full body workouts:
-Full squat - 4 sets of 15, 12, 8, 6
-Stiff legged dead lifts - 4 sets of 15, 12, 10, 8
-Pull ups - 3 sets of max reps
-Bench press - 4 sets of 12, 10, 8, 6
-Standing military press - 3 sets of 12, 10, 8
-Lying triceps extension - 3 sets of 12, 10, 8
-Standing dumbbell curls - 3 sets of 12, 10, 8
-Superset ab crunches with reverse crunches - 3 sets of max reps
This is a pretty basic workout. Like haider pointed out, you're doing 83 plus sets. You might be working out to exhaustion but most likely you're probably ending up pacing yourself. You don't want to pace yourself. You want to up the intensity and fry your muscles in the shortest time possible without hurting yourself. This workout shouldn't take you much more than 45 mins. If pressed for time, you could either drop the arm work or cut it to 2 sets as your arms would be pretty warmed up by the end of the military presses.
Again, to your question of "more or less" volume - think intensity and think shortest duration needed to get max intensity and that will answer your question.