How long to heal from celiac disease and do the symptoms completely disappear ?

At least a month: You don't actually ever heal from celiac disease except by cutting out gluten. It is a serious problem that affects your whole body when you have it. When you cut out gluten all together, it takes at least a month to have your system come close to normal. Some studies say it may take even a year of being very careful, before you feel consistently better.

Difficult process: This will vary from patient to patient & not all are the same.In addition to problems with gluten,some poor responders have cross sensitivities to other foods/food additives which also trigger symptoms.It can be difficult at times to identify all sources of gluten, such as trace amounts in beer,bourbon,soy sauce, etc., all of which can trigger new antibody formation/reactions.Expect a year or more