Matthew 24:42

γρηγορεῖτε, watch, a frequently recurring exhortation, implying not merely an uncertain but a delayed Parusia, tempting to be off guard, and so making such repeated exhortations necessary. ποίᾳ ἡμέρᾳ, on what sort of a day, early or late; so again in Matthew 24:43, at what sort of a watch, seasonable or unseasonable.

[133] Westcott and Hort.