ἐφ' ὅσον αὐτοῦ ἡ ὑπόστασις τῶν χρόνων ὑπῆρχεν → as long as his store of years lasted
Hersē: ēs, f., = Ἕρση,I a daughter of Cecrops, beloved by Mercury, Ov. M. 2, 559; 724 sq.