wet grout question

January 21, 2019
I had a friend change the tap washers in the shower, these were not done correctly and leaked down the wall and the grout on the other side of the wall absorbed it. I have now had a qualified plumber in to replay the washers again correctly. My question is how long would I expect it to take for the grout in the hall to dry up. I was told it will take months, is this correct?