I think starting off, Sans has already seen what this thing can do, but it can't see what he can do. So Sans is going to use 1 ability at a time, (Which won't get him far), Starting off weakest to strongest, Bones, Gaster blasters, Hax (Soul manipulation), Time Manipulation, and Determination. See, in the game Sans happends to make everthing go black in one of his many attacks, and it all returns to light with an attack already set up. Kinda hard to bypass this with adaptation. And Sans's Determination only can last so long when he's hit. It's going to be at one point or another, adaptation is going to bypass all of Sans's attacks. But sans has more than the attacks I just mentioned, He has Gravity Manipulation, Reality Warping, Teleportation, and Telekinesis. Before you start saying this is all bull, He has all these ability's, and Gravity manipulation, Soul Manipulation, and Telekinesis are all different ability's that he posses. Point being, this is going to be a long fight, with Sans being scared as hell fighting this thing, and in the end Sans will be tired, but, Scp-682 will be just as ready to fight as when he started. I'd say about an 30 min fight, with Scp-682 wining in the end.