One thing to keep in mind when determining the length of a single day is how long we expect the event to continue. I do not know the end goal, or if there even is one. However, if the end goal is to conquer the entire map, I'd imagine that the event would take a huge number of total days to complete. If the event keeps going on forever, it's likely that we'll be plagued by inactivity. While this doesn't matter so much for the Beta stages of testing, It's something to keep in mind for the future. To best simulate the real event, the Beta should probably keep a similar standard.