That is a very good question. I have tried to make it a bit operational, for the committee's needs.
At the first onset of Alzheimer disease or some type of dementia, people are competent. That is the time for them to put their affairs in order. That period may last one year or two years or three years. As long as they have not been declared incapable, they may express their wishes and make a request at that point for medical assistance in dying if they want it and they are not suffering from depression, in particular.
At the other extreme, there is the terminal phase, when there is really no hope that the persons will live more than a certain number of months. I believe that everyone states in their wishes that they do not want to continue to live if they are in the terminal phase of a neurological disease.
It is the intermediate stage that could present a problem. A person has been declared incapable but still enjoys a degree of mobility and still interacts with the environment to a certain point. That period lasts an average of two to three years. The stage of incapacity has been recognized, but the person has not yet reached the terminal phase in a recognized way.