This depends on the device version.
For the "P" and later specifications, a flash memory rewrite count of 20 is guaranteed.
This indicates that the data is guaranteed to be retained for 10 years from the first write.
Therefore, if rewrite is performed more than 20 times, the data is not guaranteed for 10 years.
If the user does not particularly care about data retention, a greater number of rewrites than 20 can be performed.
In this case, however, data retention is not guaranteed.