For 5 months it also says.

Revelation 9:6

"The locusts were not given power to kill them, but only to torment them for five months, and their torment was like the stinging of a scorpion. 6 In those days men will seek death and will not find it; they will long to die, but death will escape them. 7And the locusts looked like horses prepared for battle, with something like crowns of gold on their heads, and faces like the faces of men"