How long can clutch last depends on the driver.
Lousy driving habits, always half clutch on slope and everywhere else, the clutch will wear off in less than 50,000 km. If lucky can last to 80,000km.
Normal user can last at least 100,000 km.
I've changed mine. but to aftermarket clutch.
u will know clutch wearing out soon when it gets heavier and heavier to depress, and
gone when fully depress, engage 2nd gear, with clutch fully depressed, you step the accelerator, car moves forward... no clutch leow... but this stage will be dangerous...
sometimes - totally cannot engage gear... also means clutch gone...
hope that helps
else you can bring it to a workshop to get the mechanic to check. usually they will know.