Actually there is a way to get unlimited time in the demo. I played for about 4 hours straight last night. There's also a way to cross the barrier but you need 2 players to do it.
1. Start the demo.
2. Choose your agent and his colour up until you press A to "deploy agent".
3. Disconnect from the internet. I personally pulled out the ethernet cable in the back.
4. Quickly press A after disconnecting from the internet. When trying to join the game is should pop up a menu saying that friends can't join because you're online or something.
5. Hit B to cancel.
6. Reconnect to the internet and start up another game.
7. Demo time remaining will be stuck at 30 minutes for as long as you don't start any races or things like that.
http://www.youtube.com/watch?v=GQQb6gWsVoo&feature=related
Edit: I found a another way to glitch past the barriers with just one player.
http://www.youtube.com/watch?v=0u-VrtxY_DQ&feature=related
Love the product, not the company. They love your money, not you.
-TheRealMafoo
