Hizb 50 closes Juz 25, closing Az-Zukhruf, carrying the whole of Ad-Dukhan and the whole of Al-Jathiya, a third hizb in this account alone to span three separate suras, confirming that this stretch of the Quran, from roughly Juz 21 through Juz 26, is where the sixty-part scheme most consistently crosses multiple chapter boundaries within a single hizb, simply because the suras themselves have grown noticeably shorter than the Medinan material carried earlier in the cycle.
In tarawih recitation this hizb typically closes the twenty fifth night, and the connection some traditions draw between Ad-Dukhan's blessed night and Laylat al-Qadr gives this hizb a particular resonance during the last third of Ramadan, when many congregations intensify their devotional practice in anticipation of that night regardless of where the ordinary juz schedule has actually reached.
Huffaz reviewing this hizb by quarter typically find the three-sura crossing itself the main memorisation challenge, keeping each chapter's material properly sorted rather than blurring Zukhruf's closing argument into Dukhan's opening description or Jathiya's closing scene of universal kneeling.
Because Ad-Dukhan's blessed night has drawn such attention in later devotional practice, some communities treat this specific hizb, rather than any other point in the thirty-part scheme, as worth a slower, more attentive recitation during the last ten nights of Ramadan, when many congregations search especially for Laylat al-Qadr.