I’ve done high rep sessions, doing a couple different types of punches 1000 times each. I tend to do them in segments. The thing is, high repetition needs to be balanced against fatigue. As you tire, your technique begins to deteriorate. Eventually it is just poor and sloppy technique and that is not good training. So I don’t advise doing all the reps together. Break it up, switch it around, do things to manage the fatigue issue so the quality of your efforts remains high. Sure, push the limits on endurance but not to the point where it is just sloppy.