1) Remember beast with deathstroke only had ruling authority 42 months. Beast from the earth would take its place: "He exercised all the ruling authority of the first beast on his behalf" (Rev. 13:12). "The second beast was empowered to give life to the image of the first beast" (Rev. 13:15 NET). First beast is no more. Beast from the earth brought to life a new beast.
No that is not the case. The beast the gets the death-stroke is from the sea. It gets the stroke at the point of it being the 7th king (present time). When it gets healed is when it is given the 42 months becoming the 8th king.
The beast from the earth never replaces the beast from sea, it works alongside of the beast of sea as a false prophet misleading people to follow it/worship it/takes its mark. The beast from the earth does not bring about a new beast, he brings about an image and mark of the beast from the sea. Remember the beast from the earth gets healed, not replaced.
The beast from the sea (8th king) and beast from the earth (false prophet) both get thrown into the fiery lake together when Jesus comes. That is when the beast from the sea is no more as well as the one from the earth. Rev 13:3,5,11-16;19:20
3) I'd say we are now at Rev. 6:8. Next is Rev. 6:12 (sixth seal).
No Rev 6:8 yet. When we are at that point, we will not be with internet typing away on this site.
The 6th seal comes after the GT/42 months. (Rev 6:12)
2) One hour is not equal to 42 months (3 1/2 years). (11:13; 17:12; 18:10, 17, 19; cf. 8:1).
The MOTB is given out during the 42 months the beast/8th king is in power. Taking the MOTB or refusing it is Jehovah's 'hour of judgment' upon mankind. Rev 14:7