dont ask me where igot it from

but it says cambelt change shouid be done Every 6 years or Every 120k miles.
that carnt be right couid it,?
ive never seen a belt on a car to live that long maybe the belt can but Tensioners are the weaker part

mines done just over 116k and ithink its time belt came off im getting the Whirring noise simalar to the noise of a cam belt thats been tensioned too tight.
My mate said the cambelt was done by the last owner and it was around 70k on miles when it was changed,
can the timing belt covers deform in anyway on the hdi lumps causing this whir noise,
icouid just take the cover off and have alook at the belt condition but thats still a guessing game,
ideas ?
thanks