Revelation 9:15

were = had been.

for. Greek. eis. App-104 .

an = the

hour, day, month, year. A fixed point of time, not a period of duration. The four notes of time being under one article and one preposition show that the occasion is one particular moment appointed by God.

for = in order. Greek. hina.

third part. See Revelation 8:7 .