Why is it taking 4 hours to pair
I have been trying to update and pair my Apple Watch with my iPhone got 4 hours and it’s still not complete!
Apple Watch Series 3, watchOS 7
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Have a look at these special update instructions for the S3:
If you don’t have enough space to update your Apple Watch - Apple Support
Yet another option is to run the update from the watch directly - the second option here:
Or update directly on your Apple Watch