Why did absalom wait 2 years to kill amnon?

Absalom waited two years to kill Amnon to carefully plan his revenge and ensure it would be executed without immediate suspicion. He used this time to build support among his allies and to create a situation in which he could carry out the act during a feast, making it appear as a spontaneous act of anger rather than premeditated murder. Additionally, waiting allowed him to create a facade of reconciliation, making Amnon less wary of any potential threat.