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Try turning bluetooth off on your phone (you must go into settings app -> bluetooth, and not use the pull down in command center)
you need to be at home or somewhere with wifi

this forces the watch to use wifi to transfer the upgrade from the phone instead of bluetooth
mine was sitting at 18-20 hours for an hour or 2, once i disabled bluetooth it dropped quickly, and was done in 30-45 minutes.
 
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Can I get back to you next week 🤣 🤣 🤣

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My update took a lot longer than it should have. It seemed to take forever probably 45 minutes, and my watch and iPhone where within an inch of each other.
 
LOL, just updated my 5 in maybe 20-30 minutes. My 3 estimates "3 days remaining" Alert: Just changed to "about 2 days remaining."
 
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