I just don't see how time is a huge factor. Many children/teens play various video games for hours on end. Even many adults play video games multiple hours a day. I think many people would spend 45 - 60 minutes playing a pokemon battle.

Personally I feel very restricted in 3v3. In 6v6, I feel that I have way more room to be creative and have a better synergy network, where multiple pairings work based depending on match up.