Revelation 9:15

So the four angels were unloosed, who had been kept ready for that hour and day and month and year, to kill the third of men.

Revelation 8:7

The first blew, and there came hail and fire mixed with blood, falling on the earth; a third of the earth was burnt up, a third of the trees were burnt up, and all the green grass was burnt up.

Revelation 9:18

By these three plagues the third of men were killed, by the fire, the smoke, and the brimstone, that poured out of their mouths;

Revelation 8:9

a third of the creatures in the sea ??the living creatures ??perished, and a third of the ships were destroyed.

Revelation 8:11-12

(the name of the star is Wormwood); a third of the waters became wormwood, and many people died of the waters, because they had turned bitter.

Revelation 9:5

these they were allowed, not to kill but to torture, for five months ??and their torture was like the torture of a scorpion when it stings a man.

Revelation 9:10

their tails and their stings were like scorpions', and their power of hurting men for five months lay in their tails;

Treasury of Scripture Knowledge

Summary

And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men.

An hour

Bible References

An hour

Revelation 9:5
these they were allowed, not to kill but to torture, for five months ??and their torture was like the torture of a scorpion when it stings a man.

For to

Revelation 9:18
By these three plagues the third of men were killed, by the fire, the smoke, and the brimstone, that poured out of their mouths;
Revelation 8:7
The first blew, and there came hail and fire mixed with blood, falling on the earth; a third of the earth was burnt up, a third of the trees were burnt up, and all the green grass was burnt up.