Write/Erase Cycles EEPROM: 100,000Data Retention: 100 years at 25°C
This is instructive:
32-Byte Page Write Mode (Partial Page Writes Allowed)
2 ms typical write cycle time, byte or page
When doing a write of less than 32 bytes the data in the rest of the page is refreshed along with the data bytes being written. This will force the entire page to endure a write cycle, for this reason endurance is specified per page.