How long did darius the mede reign?

Darius the Mede is a figure mentioned in the Book of Daniel in The Bible, traditionally thought to have ruled for a relatively short period, specifically around the time of the fall of Babylon to the Persians in 539 BCE. However, historical details about Darius the Mede are unclear, and some scholars debate his identity and whether he actually ruled as a distinct king. In contrast, Darius I of Persia, who is often conflated with Darius the Mede, reigned from 522 to 486 BCE. Consequently, the exact duration of Darius the Mede's reign is not definitively established.