How many miles or years before the cam belt on a 05 Seat Ibiza needs changing?

Should be identical to the VW/Audi sister cars, which share the engines and other parts. 2.0L 100K miles, 1.8t 75K miles (because of early failures), 2.8L VR6 has a chain, so no timing belt interval. Always replace water pump with job, don't use the factory plastic pump. Use an all metal pump for dependability.