On page 63 of the datasheet, the N_cyc erase/write times are different for FLASH and EEPROM, althought both have 30 years data retention. On page 43 in the following PDF, the EEPROM memory address is ...

Emulated EEPROM Library for STM32 This library provides an easy-to-use interface for emulating EEPROM functionality on STM32 microcontrollers using internal flash memory. It allows you to store and ...