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"On this day of the year, long before you were born, this heap of decay," stabbing with her crutched stick at the pile of cobwebs on the table but not touching it, "was brought here. It and I have worn away together. The mice have gnawed at it, and sharper teeth than teeth of mice have gnawed at me." (11.99)
Niiiiiice. Miss Havisham may have stopped all the clocks at Satis House, but you can't stop time—or mildew, mold, and mice.
"So!" she said, without being startled or surprised; "the days have worn away, have they?" (11.46)
Miss Havisham may not have any working clocks, but she does have impeccable sense of time: she knows exactly when her birthday falls each year.