I quite like the long rounds especially if there are a lot of folk playing as you can end up with smaller battles between squads. With fewer players then a 1600 round can feel more like a career change than a game. I went for 1200 as it is more than 800 (which can feel a bit quick) but more than 1000 (pretty clever for an old’un eh knowing 1000 and 1200 are more than 800).