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Toyota recommends every 90K.
Change your air filter every 30,000 miles or sooner if you drive in dusty conditions.
Change the plugs and wires at 100,000 miles unless you experience poor performance or a drop in MPG. In that case change them sooner.
Look in the required maintenance booklet that came with the vehicle. Probably 90 or 100 thousand miles.
every 30k miles
Not often if there tarting to wear and tear you should replace them.
T-Belt replacement is recommended every 90k miles on 2000 and newer Toyota models and 60k miles on 2000 and older vehicles.
Change the plugs at 100,000 miles or earlier if the engine is not performing as it should.
How often should you change water pump in a boat
You should change the timing belt every 50,000 miles. Most cars made in the last decade have a timing chain instead of a belt, and those last much longer.
It would be a good idea to change it if you replace your water pump. Save you from having to pull that motor back up at a later date.
Replace headlight bulb only when blown.