Strong’s Greek
G2256 — hemiorion
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
"ἡμίωρον, ἡμίωριον","hJmivwron
hemiorion — pronounced hay-mee-o'-ree-on
from the base of 2255 and 5610; a half-hour:--half an hour. see GREEK for 2255 see GREEK for 5610
1 occurrence in the KJV.
Revelation 8:1
And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.