Some of you guys have a loth of faith in bashiok's words (that inferno will take long to beat). Really it all depends if we are talking about average Joe, who doesn't know most of mechanics, plays slowly (several hours per day, living his normal life, job/school). Or we are talking about diablo experts, a team, who uses account 24/7 sharing it, trading best possible items, doing pretty much a speedrun. There is gigantic gap between these two types of players. Blizzard has to balance things around an average, vast majority of people who will play d3 are very casual, so blizz won't make inferno so insanely hard, that will be a challange only for some fraction of total players population.
It all really comes down to the severity of the gear-check and drop-rates. Also, speedrunners will die (because they typically don't farm gear) and possibly don't have, or take the time, to gather resources (gold mainly) which may make them hit a brick wall in inferno (no gold to repair with for example). If that happens they will have to backtrack to hell to prepare for inferno. If that's the case we are looking at, my guess, 25 days!
Of course, if there is no real gear check to speak of, we are looking at completion in the first week.
By the way, my personal goal is 365
Aerial you are also banking on the fact that the full sets of items required to complete inferno will definitely drop within a couple of days of launch. In WoW you got gear as you progressed but in D3 its going to be largely based on luck and there is no guarantee the right items will drop that easily...on the other hand they might have made it much easier than in D2 to get the rarest items, although I hope not.
Btw, would be awesome if a mod can edit the thread title to include "Date Pool" **wink**
5 days is my guess.
Whoever does it first, it will probably be a german.
Hopefully it won't be "days".
There will be some gear checks so you can't just tunnel trough without interruptions. I think i'm fairly correct if i say that first group to clear the whole content is some small group from one of the current WoW top guilds.
Those are people who got clear concept of roles. They can pick the optimal group composition for making progress. They can put progress before personal gain meaning that if it's worth to get gear crafted for that barbarian tank they can do it as a group effort.
I'll still stick with that 4 day prediction due it being a whole new game starting from scracth, but that's assuming that 4 days has weekend in it. I haven't checked what weekday the release day will actually be.
Also note that the group can be bigger than 4 people. That would speed up the rate of gear farming dramatically.