The below assumes the OP was asking about a defensive mindset & training program since this is the S&T forum.
How many rounds you shoot depends on you. If you’re worn out after 50 rounds then there you have it. If you can shoot more then by all means do so. Coming up with an arbitrary number like 100 an hour is pointless. There are a lot of people out there who can shoot well over than & not be wasting ammo. In general I agree with the fewer rounds more often prescription. That said, you need to push yourself as well.
This was brought up in a thread a while back, but I think you should shoot until you’re fatigued every once in a while. Shoot past your fatigue & see how you feel when you hit that wall. Figure out why you start missing or fumbling or otherwise see degradation in your skills. This does two things. The first being that the next time you go out you’ll be able to shoot more. Just like working out in your comfort zone will not allow you to make much progress, stopping your range time because you’re starting to feel a little off will limit your progress. Secondly you get to recognize the feeling of not being on your game & you’ll know what to expect in terms of your performance. The real challenge comes when you see if you’re able to bring your shooting back in line once you recognize a drop off in performance. When you’re fatigued you’ll learn to drive your mind & that is what will get you through a fight.
With very few exceptions you won’t get to pick the time & place of your gunfight. Preparing for that fight under perfect conditions- be it weather, fatigue, state of mind, etc. is foolish. When the time comes you’ll need to perform in whatever condition you’re in.
There is obviously a line to draw before safety is compromised. But there’s a big difference between not being able to print one hole groups from a static stance & seeing your usual fist size groups open to hand size groups while you’re moving, working cover, manipulating & running the gun on the clock.
You may be practicing “bad” habits but there’s a lot more to using a gun as a weapon than the ability to execute the fundamentals perfectly. You may not have a perfect sight picture or you might snatch the trigger a little but you KNOW what to expect when you’re fatigued & that knowledge is very powerful.
As a disclaimer I do not advocate practicing when you’re unsafe, drunk, broken to the point that continued practice will cause severe damage, accepting a spray & pray or if it hit the target it’s good enough mentality. Likewise I do not think that this should be something you do every session. Practice & train often & hard. Test yourself on a regular basis to gauge progress.