Does quitting porn fix brain fog?

Nobody can give you a date when it clears. Pages that name one, usually week two or day 30, rarely cite anything. Where they do, the paper often does not support the sentence it is attached to.

Why is there no reliable brain fog timeline?

"Brain fog" has no agreed clinical definition, so it cannot be measured cleanly. Tiredness, low mood, poor sleep, stress and a dozen other ordinary things produce the same description. A page that gives it a single cause and a clearing date is guessing.

The same problem runs through most claims about quitting, covered in what happens when you quit porn.

What can you track instead?

Behaviour, this week. You cannot observe your attention improving, and you cannot see your receptors. You can count whether the evening went somewhere, whether you finished what you sat down to do, and how many hours moved. Those have answers by day two.

Tracking progress is also one of the best-evidenced self-regulation strategies there is. Harkin and colleagues, pooling 138 studies and nearly 20,000 people in Psychological Bulletin in 2016, found progress monitoring promoted goal attainment at d+ = 0.40, with a larger effect when progress was physically recorded. That covers health behaviour in general, not porn specifically, and the effect is moderate.

When should you see a doctor about brain fog?

When it persists. Difficulty concentrating has a long list of ordinary causes, several of them treatable, and a habit app can see none of them. A doctor is a better place to take the question than another article.