Considering how common it is for people with absolutely no training to successfully defend themselves, I see no benefit in trying to quantify minimum requirements...The Training Industry’s Dirty Little Secret

Beyond that for people who want to be as prepared as they can be, I truly don't think there is a one size fits all answer for every person or for every type of defense scenario.

Civilians who conceal carry are a very diverse group often living in very different circumstances. Training must be tailored to the individual and effective responses will be dictated by the specific details of the situation at hand. Since there are so many variables, there are no absolutes.

In the context of integrated, comprehensive self-defense, an elderly woman will want and require a much different overall approach to self-defense training and actual response than a young, strong man. Just the legal aspects alone have a significant impact on appropriate responses since an elderly individual can resort to using lethal force much more freely due to disparity of force issues.

A gun is not always or even often the solution to the wide array of personal defense scenarios an armed civilian is likely to encounter, but for some severly physically limited individuals, it actually might be the only option. There are many nuances to consider, so the focus of training will vary between different individuals. I have referred to certain skills or training as vital, crucial or mandatory on occasion, but more in the sense of using hyperbole to draw attention to an area of self-defense I feel may be ignored or overlooked. To give specific recommendations for someone, I would need more specific details about that individual.