Analysing your detailed food and symptom diary (pre-CG, repair phase, reintroduction phase, rinse and repeat) is a long slow process. Likely weeks or months, not days. Your pre-CG diary should be guiding your remove and repair phase.
You are looking for both immediate and slightly longer term patterns, as each food can take several days to be eliminated. Damage to the gut and systemic inflammation take time to calm.
There is no one-size-fits-all timescale. Some will quickly identify a food type/ group they are allergic or intolerant to. Others may have be treating longstanding nutrient deficiencies (eg. Vitamin D, magnesium, omega-3s, prebiotic fibres).
As Dr. Mosley says (p.190) “we don’t recommend removing too many foods at one time, so it might be helpful to do remove and repair in several stages. You can always repeat the process with the less troublesome foods at a later date.”