Revelation 8:1

And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.
— Revelation 8:1, King James Version

In other translations

World English Bible (WEB)

When he opened the seventh seal, there followed a silence in heaven for about half an hour.

American Standard Version (ASV)

And when he opened the seventh seal, there followed a silence in heaven about the space of half an hour.

Young's Literal Translation (YLT)

And when he openeth the seventh seal, there came silence in the heaven about half-an-hour,