Most vehicles call for their Timing Belt to be changed between 90000 - 100000 miles.
Like any other Belt on a vehicle the Timing Belt is made of rubber that after time and mileage will become weak and break. Unlike other belts on vehicles the Timing belt keeps the all of the engines components moving at the right time, so when it brakes the damage is usually much more severe. Some vehicles such as a 2005 Hyundai Sonata calls for the Timing Belt to be replaced every 60000 Miles or 48 Months. This is because preventive Maintenance directly adds to the longevity of your vehicle.
A Timing Belt replacement requires between 2 - 8 hours depending on the engine size, options (Air Conditioning, Power Steering), and the number of camshafts. Most vehicles timing belts are wrapped around the Water Pump, a Tensioner, an Idler Pulley, and cover a couple of seals. It is due to these reasons that we purchase Timing Belt Kits (which include all the servicable components involved with the Timing Belt) and bundle it into one job, saving you the repeated trip to the garage later on, and saving your wallet from the hefty price of labor to do the job again when one of the smaller components needs to be changed.
Most four cylinder Honda's, Toyota's, and domestic vehicles call for 2-4 hours of labor to change out the Timing Belt and Water Pump bringing the job total to somewhere between $549.90 and $799.90 plus tax.
A vehicle with a six or eight cylinder engine or a vehicle with two or more camshafts (ie. Audi A6, Toyota Camry v6) calls for more like 6-12 hours of labor and can run between $1049.90 and $1699.90 plus tax.