Context: In 1624, when the Ottoman Sultan recognized Fakhr-al-Din II as Lord of Arabistan , the Druze leader made Tiberias his capital. Fakhr ad Din II, one of the most famous Druze Emirs, was succeeded in 1635 by his nephew Mulhim Ma'an, who ruled through his death in 1658. Fakhr ad Din II's only surviving son, Husayn, lived the rest of his life as a court official in Constantinople. Emir Mulhim exercised Iltizam taxation rights in the Chouf, Gharb, Jurd, Matn, and Kisrawan districts of Lebanon. Mulhim's forces battled and defeated those of Mustafa Pasha, Beylerbey of Damascus, in 1642, but he is reported by historians to have been otherwise loyal to Ottoman rule. Emir Mulhim Ma'an died in 1658, succeeded by two of his sons.

Question: How many years did Mulhim Ma'an serve?

Answer:
23