I don't know, the more I play, the more time it takes.
Also, it's more comfortable to play with a time buffer. You don't necessarily have to choose the full time limit; it's just more enjoyable not to feel like you're on pins and needles with only a few seconds left on your turn... I often play without a time limit, and the turns feel like they're on a normal 6-minute timer. After the timed matches in the Tournament Edition, the time limits in Soda really annoy me.