It's very pleasant, that you've addressed yourself to us, we would be glad to help to develop VCTF mode in such distant continent as Latin America
Actually each server has its own settings. On some limit is 3, on some 5, on others 100. I would suggest to put 100, so match would never end up before time is over...even on official clanwars there is no limit, teams play exactly 20 minutes. And yes, 20 minutes is a timer for each server everywhere. At least i have never seen timer different from 20 minutes
I hope that helped you, would be glad to meet you in the game with 500 ping