Short of a crystal ball, no one can tell you how much time he would get for fleeing. Other factors may have bearing on that, such as priors, age of the defendant, what other charges the government is successful at getting to 'stick', etc. I don't think anyone on a message board can predict such a thing----perhaps an attorney in the jurisdiction in question could advise you more precisely.

How did he cross the border as a wanted felon? or did he flee before a warrant was issued?