If you are worried about time, make sure the valves are actually out of spec before tearing it all apart. There is a minimum clearance and a maximum clearance. Anywhere in between is okay. I currently have 52000kms (30000miles) and still have not had a valve adjustment and the clearances are still with-in factory specs. Maybe I'm just lucky. Generally if your not having problems starting or with loss of fuel mileage valves are fine, but piece of mind comes with at least checking them. Good luck.
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