I checked and the longest time limit you can allow is 90 minutes. However, this is WAY more than enough time to finish a match, at least all those that I have played, and I've got about 45 hours online play under my belt (yes, I know, not that much, but enough to answer the question). The fact that matches can not exceed 90 minutes should not discourage you from buying the game because even both rounds of a long, drawn out frontline battle is typically only about an hour long.
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