The game is over when a player is CheckMated or (upon agreement) the king is taken, or any player's time runs out. BugHouse is usually played on 5:00 min clocks (i.e. each person has 5 minutes to make their moves).
Think of it as ChesSers for people who don't like checkers. Some BugHouse players have found that they are fairly decent at ChesSers on the chess side. No players have been found that have been converted from ChesSers first to BugHouse, so no comparison can be made.