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Mine took I believe around 10 to 20 minutes, didn’t time it, but it wasn’t too bad, that time includes the download time on the phone and sending it over to the Watch
 
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Mine took I believe around 10 to 20 minutes, didn’t time it, but it wasn’t too bad, that time includes the download time on the phone and sending it over to the Watch

I started mine at the beginning of a 30 minute TV show. It was finished well before the show ended.
 
I just timed mine updating after seeing this thread, and from start to finish: clicking download and entering iPhone password, till the Apple Watch finishing booting post update it took:

26 minutes and 3 seconds
 
Took around 10 min to download the update to the watch, 15 min for the actual update to boot into watch face.
 
less than 10 minutes to download and less than 10 min to install on mine.
 
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