So how long can you go? Started my second game. Just for fun I let it run dry, as long as it would stay on. Got 2 hours 23 minutes. No flight mode, but using headphones instead of Switch speakers and around one third of an screen brightness. After a bit of loading it was pleasant to see no data was lost, I was able to continue just where I left off. For anyone interested: I went for small pangaea, Saladin, fast speed this time as my first game on normal speed took 30 hours.. Maybe that will infect the battery life a bit? As its not as intensive? Dunno. Edit: oh yeah, forgot to mention. The first time the console noticed me about battery life was already at 1 hour 56 minutes so pretty early. But the game kept on going.