A training sword has no fixed service life. Its durability depends on training frequency, striking power, target material, maintenance, and storage. Pell work with a suitable target usually causes less unpredictable damage than uncontrolled steel-on-steel sparring.
Inspect the blade, edges, guard, grip, and pommel after every session. Stop using the sword if you find cracks, severe dents, permanent bends, or loose components. Regular cleaning and dry storage will help prevent corrosion and extend its useful life.