ἐφ' ὅσον αὐτοῦ ἡ ὑπόστασις τῶν χρόνων ὑπῆρχεν → as long as his store of years lasted
2ᵉ sg. impér. prés. de ἵσταμαι.
ἵστω: Soph., Arph. (= ἵστασο) 2 л. sing. imper. med. к ἵστημι.
