Need to no after how many miles we have to change the timing belt

It is recommended that a timing belt should be change every 100,000km. Honda's and Acura's especially. Whenever the water pump is changed, it is also wise to change the timing belt too as it is all in one spot, and VS. In some cars, [Acura's], when the timing belt breaks, it also can tear your valves in your engine apart, so I hope that this answers your question

Name vechicle type model year.depend on type vechicle some timing belts need replacing at 60000 or some vechicle 90000.if your vechicle type has water pump in which you have to remove timing cover and timing belt replace timing belt that way you be in safety zone.see if water pump goes bad if your vechicle timing belt drives water pump would not hurt to replace timing belt when you replace water pump.