Quoting CB Droege
death match is a bad idea... that's not actually playing the game anymore.
How do you figure?
In LAN multiplayer the only options you have for game time is Death Match and Regicide.
In regicide you try and kill the other player's/team's king before they kill yours.
In death match all players/teams start with an allotted resources and battle to the death.
Playing death match with the time limit, the winner is whoever defeats the other team or has the highest score at the end of XX time.
Those are the only two lan game modes, unless you are talking about the Conquerors expansion which had some additional ones.