Are you saying that you don't suffer (or at least consciously feel the effects of) cognitive fatigue? If I am interested in something, I like to focus on it for

Are you saying that you don't suffer (or at least consciously feel the effects of) cognitive fatigue? If I am interested in something, I like to focus on it for quite a while, but after enough time passes, I just can't any more. I do think that there are some people who can naturally last much longer doing cognitive work than is the norm, though, much like some athletes are natural ultramarathoners. So perhaps you are one of those people.