As long as he or she is elected to be a representative. There is no limit to how many terms a House of Representative member may be elected.
The United States congressman or representative can be elected many times. There is no limit for the representatives to be re-elected in the post.
Your question is incomplete -- which representative?
Should have at least one representative for each state
435
however many representative their are
100
120
10
Five
none!
Mostly all the small states representative's.