The equation is simple. Between Western Front and Skydagger Keep, you have a minimum of 7 advances, or 8 if you take the mountain road. Each advance costs 2 to 4 time segments (taking Time passes into account). So you could succeed in all missions and still loose the Campaign game because of bad advance rolls. But you can’t think like that at the beginning : you have to think in probability terms. Which is difficult because you won’t know how many Pressure you will have at each stage.

So let’s consider you have:

- A mean of 1 Pressure at each advance. Your mean Time spent will be 2.7, that’s 19 in 7 advances. So if you have been unlucky at your first advance, you are at 6 segments on the first Time clock, you have 24 ticks of time available, meaning you have 5 “spare”. But let’s say only three, to give yourself a safety margin. Those 3 spare Time, you can use for 3 additionnal missions (without advancing), or to account for mission Failure penalties when you lose Time. If you have been lucky, or if you Don’t want to spend more than one mission at each location, then you can take the longer northern road.
- A mean of 2 Pressure at each advance. Your mean Time spent will be 3, that’s 21 in 7 advances. It’s not such a big difference, which is not obvious before you do the calculation. But it means you have almost no margin to do additionnal missions.

If you are Under 6 Time at Western Front, it gives you a bit more margin, just adapt the above calculations.

So the players have to try to roll their advance with no more than one die. But it’s interesting to note that the difference between mean Time spent at each advance is NOT that big if you roll 1, 2 or 3 dice (2.7 , 3 , 3.3 respectively). They should not fret too much if they can’t spend a Horse use to reduce their pressure on a specific advance. It looks bad but it is not that bad, if it’s only once in a while.