I'm away from base until the end of january - so was interested as I was a late upgrader from 7 to 7.5, and therefore qualified for the free grace period offer. I upgraded the licence to 8, then went to download the 'update' to discover it was a 9Gb download - and BT-wifi reports two days on my present connection. Not that it makes much sense as BT throws me off every few hour and requires a re-log in anyway. Even on fast reliable link 9 gigs is pretty big, but on wifi it is crazy. I've persuaded the IT manager here to do it for me onto a stick - but even then it says 4 hours, but at least it shouldn't fail!
I'll just have to wait and see if it works!