How often should the spark plugs be replaced in a BMW M8?

I recently bought a BMW M8 and I want to make sure I am properly maintaining it. I'm wondering how often I should replace the spark plugs and how can I tell when they need to be replaced?

Spark plugs should generally be replaced every 30,000 miles or every 3-4 years, whichever comes first. However, if you notice any symptoms such as difficulty starting the car or poor fuel economy, it may be time to replace them sooner.

You can also consult your owner's manual or speak to a mechanic to determine the best replacement schedule for your specific car.