Do I necessarily have to complete the 63-day Marengo diet, even if the symptoms have subsided?

The 63-day Marengo diet should definitely be continued for the 63-day period, even if the symptoms have in the meantime subsided earlier than anticipated. Also if symptoms such as flatulence, pulpy stool or other allergic symptoms should still be present one week prior to the end of the diet, one should not lose patience.
Please bear in mind that a destabilized intestinal flora, which in some cases has been present for many years already, cannot be regenerated within a few days, and that the organism needs time to recover.
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