Round timers should be halved(or more) on practice rounds.
Many times people are finished loading in during a practice round. Shortening will prevent it from stretching on.
I think the point of a practice round is to get an slight idea on the opposing teams tactics and skill. I also think most people just try to end the practice round as quick as possible but it's still a part of the game that should be enjoyable before the actual game. It also gives enough time for a server to fill up