LAW 522-001 – Civil Procedure II
A defendant in America has 21 days after being served to submit an answer or 60 days if he waived service under Rule 4(d). Rule 12(a)(1)(A).
The US government always gets 60 days. Rule 12(a)(2)
Entering a Default Judgment
In all other cases, the court enters default after the plaintiff files a motion and serves the other side.