Christ. Ok, its Calcium Chloride, not Sodium Chloride, but whatever. A 'salt' is a 'salt' no matter what 2 ions its made of. If you don't know what this means at all, go ask your science teacher at School. What it does is lower the melting temperature of water to keep you from falling on your ass on the front steps. (The ice melts when its colder, get it?)
Here we go - that means that the snow is melting faster, because it can melt at a lower temperature. A 10% salt solution can melt at -6 instead of 0. The salt draws the water from the ice due to that whole gradient of a solution thing.
The salt draws the water out from the ice, and makes the water effectively thinner. This helps to then bond the ice crystals. The goal here is not to make the ice last longer, but to make it harder and faster. The salt speeds up the melting, makes the ice harder by bonding the crystals, and there you go. Faster snow.
So with all that said - HOW BORING IS ALL THAT? Go ride and don't sweat it.