How much classroom prep time should armed teachers devote to firearms training?

The "Farnam Drill" is shot against a 8.5"x11" sheet of paper at 10 yards. The shooter starts with a concealed, holstered, handgun loaded with 4 live rounds and one dummy round and a spare magazine with 3 rounds. On the buzzer the shooter draws and shoots until there is a stoppage, clears the malfunction and shoots the gun empty, performs a speed reload, and shoots twice.

According to John Fogh, a reputable firearms instructor, 'Competent' is 100% hits and completing the drill in less than 18 seconds consistently. A good instructor can get you there (or pretty close) in a weekend and less than 1000 rounds. Maintaining that is probably shooting 50 rounds a week.

The latest round of FBI suspect interviews conducted for the third book in the officer assaulted and murdered trilogy, Violent Encounters, it was revealed that those suspects believed that the police officers they shot trained between two and three times a week with their firearms.

In reality, most police departments only train about two times a year, averaging less than 15 hours annually.

In contrast to the frequency of police training, those same suspects revealed that they practiced on average 23 times a year (or almost twice a month) with their handguns.

I once had a firearm instructor tell me that only 20-30% of bullets shot by a cop hit the target.

Tim Dees, retired cop and justice professor said, "Most marksmanship training is conducted on static pistol/rifle ranges, where the targets don’t shoot back and the shooters know well in advance that they are going to shoot. Actual combat shooting is nothing like that. There is some training with paintballs and simulated ammunition that is more realistic (because not making good use of cover gets you hit with projectiles that aren’t deadly, but sting a lot), but it’s expensive and requires special venues and lots of setup.

If you watch videos of police shootings, you’ll see very few carefully aimed shots. The police are usually attacked without warning, and shoot defensively at the threat. The military in combat might aim a little better, but much of their fire is for cover or suppression, intended to make the enemy keep their heads down and denying them effective fire. Police don’t shoot that way. Police have to have a specific target and a specific threat.

Police firearms training in the U.S. is probably as good as it's ever been, but the effective hit ratio isn’t any better than it was in the revolver days, even though a lot more rounds are fired.
Most cops go their entire careers and never fire their weapons outside the pistol range.".

I would hope its the same for armed teachers.