Complexive Aorist.—The complexive aorist is used to survey at a glance the course of a past action from beginning to end:
τούτῳ τῷ τρόπῳ τὴν πόλιν ἐτείχισαν
a. This is often called the ‘concentrative’ aorist, because it concentrates the
entire course of an action to a single point. When used of rapid or instantaneous action this aorist is often called ‘momentary.’
b. The complexive aorist is used either of a long or of a short period of time:
τέσσαρα καὶ δέκα ἔτη ἐνέμειναν αἱ σπονδαί
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].