Xerol
Emperor
Well, if you are going to be gone for several days, you could order your units to do things that take several turns and you lose no time that way.
Actually, NOTHING occurs if you don't login. Units don't move, workers don't work, cities don't grow/produce/research. If you miss a turn, you quite literally miss a turn.
I'm also confused, has this started yet, or not? If it hasn't, I might sign up.