Download process took 10 minutes on a 15Mbps line, installation took 3.5 hours. App updates took another 15 minutes
I enrolled for the slow ring and my timings were pretty much the same as yours to upgrade.
Acer Aspire E11 laptop with only 32GB eMMC storage. I didn't have enough storage left on the laptop itself and so had to use the external drive option when prompted to by the 'preparing to install' process (I then used a USB flash drive).
The download itself was quick, but the installation part took over three hours. At one point I thought I'd have to leave the laptop plugged in overnight as the percentage complete was crawling up - it took 2 hours to get to 11%! Thankfully things sped up considerably after the first automatic restart that it does as part of the installation process, and it was finished by the time I went bed.
From my small amount of use since upgrading, so far I've got to say it's been worth it :smile:.