ἐφ' ὅσον αὐτοῦ ἡ ὑπόστασις τῶν χρόνων ὑπῆρχεν → as long as his store of years lasted
ἐπιών, ἐπιοῦσα, ἐπιόν (AM)μτχ. ενέστ. του ρ. έπειμι.
