Matthew 14:15

ὀψίας γενομένης. In the Jewish division of the day there were two evenings. According to the most probable view the space of time called ‘between the evenings’ (Exodus 12:6) was from the ninth to the twelfth hour (Jos. B. J. VI. 9. 3). Hence the first evening ended at 3 o’clock, the second began at sunset. In this verse the first evening is meant, in Matthew 14:23 the second.

The meaning of ἡ ὥρα is not quite clear, perhaps the usual hour for the mid-day meal.