Do I have time to make my connection at PEK?

On January 4, I am arriving at terminal 1 at 425pm PEK on United Airlines. I leave from terminal 3 at 7pm to RGN on Air China. It appears I need to go through entry and exit points. I ⇒ I: 120 Minimum Connection Time (MCT) between T3 and T2 I did not see transfer time from T1 and T3.