I'd recommend doing this on player matches of Blitz on Deep Forest.
The people who are not on the host's team simply kill themselves each of the 3 rounds, so that the rounds ends, and the host's team wins. Mages work best, as they have the Meteor Storm skill, and it can kill the whole team if they are all grouped together. They also have Burning Finger, which they can kill themselves with by casting it at their feet if the Meteor Storm somehow doesn't kill them.
If the other team is quick about killing themselves, you can get a 3 round match done in about 45 seconds. Plus since it's on player, the next match will start after a small time, and no one will have to keep rejoining a new game after each match, which I do not believe you can do after the last map of Crusades.
This is faster then doing Crusades.