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wrote:

If you have eliminated the source it can take along time to dry out
e.g. year or more. Also old lime plaster if damp for a long period can
become hygroscopic i.e. absorb atmospheric moisture. This results in
intermittent damp patches in peculiar places e.g. half way up walls,
and is most noticeable in humid weather like today or when there is a
change from cool to warm/humid.
So give it a year or so.

cheers

Jacob

I would not be so pessimistic.

IF you have no rising damp - and its a big if - 4-6weeks will take care
of damp plaster.

If you have sodden internal brick walls, expect issues all winter but
central heating does dry interior walls pretty effectively with cold dry
air outside.

If you haven't fixed the rising damp, then as another poster has bluntly
put it, with a waterproof covering in the outside, you will get
perpetual damp inside.

Its not clear exactly what is damp, whether damp proof or breathable
membranes are, or what construction the house is, and its insulation
standard.

All these make substantial differences.