When Shimamura arrives for his second visit to the resort town, how many days does Komako say it has it been since she and Shimamura spent their night together, and how can she be sure of this?

Komako says that it has been one-hundred and ninety-nine days since their night together. Shimamura wonders how she can be sure of the date, and Komako reveals that she can check her diary to be sure.