ثُمَّ يَدْعُو بَعْدَهَا حَتَّى تَنْجَلِيَ الشَّمْسُ،
Translation: Then supplication is offered after the prayer until the solar eclipse clears.
Injila’ means the clearing of the eclipse. If the two units finish while the eclipse remains, supplication and seeking forgiveness continue; this passage does not make additional units obligatory.