तेन निर्वृत्तम्

Operational rule vidhi

The affix ठञ् comes after a word denoting time in the Instrumental -3rd case in construction in the sense of 'to be accomplished by that time'.

Word by word (padaccheda)

With / by तेन tṛtīyā · ekavacanaSubstitute / term निर्वृत्तम् prathamā · ekavacana

With / by Tṛtīyā (3rd case): accompaniment or means.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

तेन निर्वृत्तम्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix ठञ् comes after a word denoting time in the Instrumental -3rd case in construction in the sense of 'to be accomplished by that time'.
Thus अह्ना निर्वृत्तं = आह्निकम् "to be accomplished in a day" i. e. a certain portion of reading &c, आर्धमासिकम्, सांवत्सरिकम् ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.