> What I don't know is what behavior I should expect at that point

Denny, have you had a read of these

Everything a System Engineer Needs to Know About Serial
EEPROM Endurance

http://ww1.microchip.com/downloads/en/AppNotes/00537.pdf

EEPROM Endurance Tutorial

http://ww1.microchip.com/downloads/en/AppNotes/00601.pdf

Using the Microchip Endurance Predictive Software

http://ww1.microchip.com/downloads/en/AppNotes/00562.pdf

Endurance

http://ww1.microchip.com/downloads/en/DeviceDoc/end240.zip

Total Endurance Software Download

http://ww1.microchip.com/downloads/en/DeviceDoc/totend40.zip

"Microchip's New Total Endurance Disk Provides An Innovative
Tool For Predicting Application Life Of Serial EEPROMs"

http://ww1.microchip.com/downloads/en/DeviceDoc/061193.doc


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