Transit in Yinchuan Airport

I will be taking China Southern Airlines from Kuala Lumpur to Urumqi but was being told that I cannot do a check-thru to Urumqi but need to do a transit & check-in again at Yin chuan. My original transit time is 4 hours but the airlines has changed it to 2 hours.
How big is the airport? Will the 2 hours' transit time be sufficient?