Changchun train to inner mongolia takes how much time and cost ?

Inner Mongolia covers such a large area, so what is your destination there? Anyway, I presume you wanna head for Huhhot, the capital city of that region. Well then, the duration of the rail service is around 24 hours and the ticket fare is CNY177.5-213 for a hard seat and CNY325.5-598 for a sleeper (hard and soft classes).

It will be very cold and snowfall is dense during that time, so you can see snow scenery there. However, it is best to travel there in July to Sep. when you can fully enjoy yourself on the grassland.