31 The particle כִּי (ki) here is probably temporal, introducing the protasis to the main clause in v. 17 (cf. 473 כִּי 2.a). However, that would make the translation too long, so the present translation does what several modern English versions do here, though there are no parallels listed for this nuance in the lexicons.
32 Heb “Jeremiah came into the house of the pit [= “dungeon,” 92 בּוֹר 4 and compare usage in Gen 40:15; 41:14] and into the cells [this word occurs only here; it is defined on the basis of the cognate languages (cf. 333 חָנוּת)].” The sentence has been restructured and some words supplied in the translation to better relate it to the preceding context.
33 Heb “Jeremiah.” But the proper name is somewhat redundant and unnecessary in a modern translation.

In other versions

When Jeremiah had come to the dungeon cells and remained there many days,

Jeremiah was put into a vaulted cell in a dungeon, where he remained a long time.

So Jeremiah went into a cell in the dungeon and stayed there many days.

Jeremiah was put into a dungeon cell, where he remained for many days.

So Jeremiah came to the dungeon, even to the vaulted cells, and Jeremiah stayed there many days.

When Jeremiah was entered into the dungeon, and into the cabins, and Jeremiah had remained there many days;

Public Domain