In Australia they recommend a timing belt change every 60,000 kilometers or 45,000 miles. The issue isn't the belt itself breaking breaking. The cause is either the idler pulley seizing or the tensioner bolt breaking. Once this happens it's a case of Piston, meet valve. I've managed to get 67,000k's out of mine but i was wary about drving it for the last 3000k's. The mechanical shop where I work have done about 10 in the last 6 months. It's an engineering design issue.