If you change your oil every 3000-5000 miles, the Timing Chain should last as long as the engine, there really is not a replacement interval. The most common cause of timing chain failure is dirty oil, which becomes abrasive and wears out the chain and the guides.
Timing chains are generally not a maintenance type item. There are normally no published service interval for timing chain replacement. Please check the maintenance schedule for your 2003 Toyota Corolla to confirm this for your vehicle. In most cases a timing chain will last the life of the engine or until other major engine repairs are necessary.