Okay, that's some creepy wordplay guys.
I guess waiting around to die is pretty boring because there are fiduspawn thingamjigs lying around and a pile of horns. Just what are those trolls doing with their remaining free time? You'd think after winning Sgrub and making a universe it would be something productive instead of this passive approach to their impending doom.
You forget just what giant basket cases the Trolls are. My guess of what everyone is up to-
Karkat: Doing his best hacker/Patton impression and watching John sleep, as we've seen.
Terezi: Chewing on colored wires to escape the gray of everything else.
Kanaya: We now know.
Vriska: Ditto, although this stills leaves a few unanswered questions about who's responsible for what.
Tavros: Possibly trying to look tough, for his own sake if not Vriska's, as it were.
Equius: Being strong, staring at Aradia from a distance, and building more robots probably.
Nepeta: Prancing around on other people's keyboards.
Sollux: Satisfying his computer itch and Platonic-hatefriendship with Karkat.
Feferi: Hovering over Sollux's shoulder and trying not to dehydrate.
Gamzee: Sitting in the Horn Pile and huffing Sollux's canned-air.
Aradia: Being spooky and IMing Scratch, when not chatting with herself for no good reason.
I never did figure out just how long they were hanging around that asteroid, but it doesn't seem like more than a few days. It also seems like from start of trolling the kids to their Rift is about six hours.