I guess it depends. Some scholars contend that the Gog/Magog war is the mid-point of the Tribulation which would make only 3 1/2 years remaining until the 2nd coming. They get this from the biblical description of the Anti-Christ breaking his covenant with Israel at the mid-point of the Tribulation period.
Others, like Tim LaHaye, contend it would happen at the beginning of the Tribulation and be the event which brings the Anti-Christ onto the world scene. Which would mean only 7 years until the 2nd coming based on the one week or 7 years in Daniel 9.
Still others claim it doesn’t necessarily have to figure into the Tribulation era at all, that it could be a completely separate event which would make you correct, anywhere from 0 to 10 or even more.
Interesting analysis anyway. Gog/Magog is definitely something to study.