<<Disclaimer: Verify this information before applying it to your situation.>>

The issue of how long it takes to get a response to the start of a GFD in
a celiac has to be individualised to the patient and the type of symptoms
the patient has.  Most patients notice some change in the symptoms within
days  or 1-2 weeks of starting the GFD. A few will take longer to start
to respond.  "start to respond means less severe symptoms not no
symptoms. The more exacting the gluten free diet is the faster there may
be healing.  Lactose intolerance may take longer to get better so
avoiding milk products for a while these people sometimes help. Rare
complications may delay healing.
The most common reason for a deal in remission of symptoms is a diet that
is NOT GF.
Dermatits herpetiformis responds more slowly to the GFD. It may take
months for theitchy attacks to go away, sometimes even longer.  Hence
Dapsone and other drugs are used to suppress the symptoms of the itch.
These usually do this quite effectively, but need close monitoring as
they can be associated with some side effects.
Not Medical advice
Joe Murray