The answer is: 31 years

2 Kings 22:1

Josiah, a standout king in the lineage of David, ascended to the throne of Judah at the astonishingly young age of eight years old! This royal was not just a figurehead; his reign lasted for 31 remarkable years, as highlighted in 2 Kings 22:1. What makes Josiah's story truly captivating is his commitment to spiritual reform and returning the nation to the worship of Yahweh, making him a positive example in a beleaguered time when idolatry and corruption ran rampant.

Under his leadership, Josiah discovered the Book of the Law during Temple repairs, often believed to be part of Deuteronomy. He was so shocked by the neglect of God’s commandments that he initiated sweeping reforms to purge idolatry from Judah. Imagine the impact of rediscovering a long-forgotten text that transformed hearts and laws! Amidst this, it's fascinating to note that he ordered a celebration of Passover such as hadn’t been seen since the days of the Judges, reaffirming the covenant community.

Trivia tidbit: Josiah's religious reforms extended beyond Judah—they echoed the Josianic principles carried forward later in subsequent reformist movements. This stands in stark contrast to other rulers who embraced rebellion over faithfulness. His legacy was so significant that even centuries later, he was remembered as the king who "did what was right in the eyes of the Lord" (2 Kings 22:2). Let this serve as an inspiring call to reflect on leaders who commit to greater moral integrity.