Slightly wrong place, but I will answer for you.
The time progression is the easiest setting to explain, the number used translates to the amount of "Game Time" hours in 1 "Real Time" hour:
1 = 1 game hour = 1 Real time hour.
6 = 6 Game Hours = 1 real time hour.
12= 12 Game hours = 1 Real time hour.
etc etc.
So to simulate 24 game hours in 2 real time hours would require a 12 progression.