Revelation 8:13 And I saw, and I heard an eagle flying in midheaven say with a loud voice: “Woe, woe, woe to those dwelling on the earth because of the rest of the trumpet blasts of the three angels who are about to blow their trumpets!”
This verse seems to be the beginning of the "Woes".
The first woe should then be described in the next chapter. It is about a 5 month long period of locusts that torment people, but do not kill.
The second woe contains much more. It spans from Revelation 9:12 to Revelation 11:14. It looks like for me that the second woe could be the coming 42 months and 1260 days and time, times and half a time.
So this means that the things in Revelation 8 to 9:11 happen before the 42months/1260 days/3,5 years.
In fact I believe Revelation 8 to 9:11 has already happened since 2010.