I watch and apple care

According to Buy an AppleCare plan - Apple Support:

• In most countries and regions, you can buy AppleCare+ within 60 days of your device purchase. In Japan, you can buy AppleCare+ within 30 days of your device purchase. In China mainland, you can buy AppleCare+ on your device within 7 days of your device purchase or in an Apple Store within 60 days of your device purchase. (At the Apple Store, you'll need to bring your proof of purchase, and we'll inspect the device.)

60 days, or a year if Apple still offers regular AppleCare in your country.

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If you mean applecare+ then see this;

AppleCare Products - Watch