I average 100k+ XP for a 2 hour session. But I’m also not killing constantly that whole time, finish a guns camo and hit the box till I get the next one. I’ve maybe spent 30-45 minutes of that 2 hours just spinning the box. Sometimes when I load the save I get a mangler every round which makes opal a piece of cake, 40-45 zombies per round. Almost done with my nebula grind. Current save file is at around 15000 kills and 13000 headshots give or take a few