Depends on the shim thickness you find and any ridged wear on the valve seat.
Wear usually means thinner and thinner shims.
Thin shims mean you are running out of adjustment as there is a minimum shim thickness it is advised not to go below. Can't recall what that is.
If it is wearing thick shims then it may have been treated to a valve job in it's past.
My 74 3C had very stable valve clearances and over a quite high mileage I only needed to do them twice and even then it was only a couple of the valves each time but that was in the leaded petrol days so I'm probably talking rubbish where unleaded fuel is concerned.
I do remember though that the shims were all quite close to the thinnest available when I bought it and it was only a year old. I was a bit perturbed by this so I bought another cylinder head as a spare but in the next 17 years I never needed to use it. I gave it to the bloke who bought the bike when I sold it.
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