Walls will take at least 6 to 12 months to dry out according to the damp proof industry's own Code of Practice.

How long does damp brickwork take to dry out?

Indeed in the damp proofing industry's own Code of Practice it states that “walls will take at least 6 to 12 months to dry out. The presence of paints or renders will substantially extend the drying period”.

Will wet bricks dry out?

FYI, a wall that has suffered a major wet spell takes a long time to dry out, rule of thumb is about one month for one inch of brick. ... These are great and will suck moisture out of the air and draw the water out of the wall, hard to say how long for without seeing the extent of the area affected and how wet.