Revelation 8:1
And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.
Nave's Topical Index—AKJV

Revelation 9:15
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.
Nave's Topical Index—AKJV