There's nuance to that, as well. Official Adventist theology is that even after the Judgment there will not be an "ever-burning Hell", with eternal torture and suffering, but rather that the unrighteous (even including Satan and his evil angels) will be burned - body and soul - into non-being in an instant.Of course, folk belief and desire for retribution being what they are, many SdA folks will tell you that that instant will "feel like eternity".
There's also a weird bit about how after Jesus returns and takes the righteous away with him Satan will rule the world for, like, a thousand years. That's expected to be pretty awful for everyone left behind - so, you know, don't you kids go swimming on Saturday - but it's intended to demonstrate, once and for all, that Jesus' way is the best way. (I admire the fair-minded impulse behind that narrative, like: gotta give Satan a shot!) After that, though (because obviously life with Satan in charge will be awful), God'll annihilate all them, and (if I recall correctly) all of the righteous, along with God and Jesus and all the angels, will move back to live on Earth.
Source: raised SdA.
(No idea what JWs have to say about any of this. I ask them very nicely not to bother me again, and they've always - the odd pamphlet through the letterbox apart - done so.)