You can either train hard, or long, but you can't do both. If you are really going balls out to failure then you'll get one real set in per exercise - and the per workout volume tolerance range varies widely from the hardgainers at 3 exercises for 1 set each, to average people at 3-6 exercises, and then those people that can tolerate quite alot of volume 6-10+ total sets to real failure per workout.
Most people training like this do best training once or twice a week. You can do all the exercises in one workout, and then wait a week to train again, or you can split the exercises into an A and B using whichever two non-consecutive days you choose - like Monday-Thursday. The number of exercises per workout, and the frequency of your workouts is entirely predicated on your individual tolerance to exercise stress in a given session, and how quickly you can recover and supercompensate before the next workout.
I always recommend training to absolute momentary muscular failure because you will build just as much muscle as someone doing 3 sets or 5 sets per exercise. I instinctively trained this way from the first set of barbell bench press at 13 years old with my Sears concrete weight set - bench press with leg extension for good measure.
If you do this long enough you will truly know when you are going to fail on the next rep, at which point, if you want to try a volume approach you will be much better able to gauge your training intensity. You'll also be able to train where you stop at the last full rep you know you can complete - whereas alot of guys nowadays are training half-assed going rir (reps in reserve) of 1-2 when they had 3-4 in them etc. How can you rate your rpe(rate of perceived exertion) if you haven't consistently gone to absolute momentary muscular failure to know what that actually is?
Basically train HARD, rest, repeat - over and over. This is the way.
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