Q: for what number of program-erase (P/E) cycles is rated the LOCUS internal flash?
LOCUS (LOCate US) is the name of the MT3339 innate data-logger solution using the MT3339 internal flash. Unfortunately, any Flash memory suffers memory wearing.
http://en.wikipedia.org/wiki/Flash_memory#Memory_wear
According to the internal Flash specification, the maximum number of program/erase (P/E) cycles is 100K (100,000).