When the sixth trumpet blew (Rev 9), how long did the four angels prepare to kill 1/3 of the human population?

There is nothing better for a man, than that he should eat and drink, and that he should make his soul enjoy good in his labour. Ecclesiastes 2:24

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. Revelation 9:15

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