I definitely don't think 8wks is enough time. Most med/surg floors are 8-16 wks. ER can be considered up there with the critical care areas, and in my exp/research, ICU settings are grouped w/ ER, & their orientation is a minimum of 16wks to 6mos. And I've heard of some being 1 year.
I think its great that you want this area, and I don't agree that new grads should be banned, but it will be difficult in 16wks, and probably unsafe in 8wks. That being said, I agree with other posters that it depends on the facility, patient population, and education dept. Also depends on how quick you catch on, your current set of skills, etc. Be sure and ask about what happens if at week 7 or 8, you're still not ready... Do they allow more time?, if so, how much more time? If you're still not ready, then what happens, do they fire you? If in the end 8 wks isn't enough time & the only option is termination, it will be detrimental to you as far as your confidence is concerned. Personally, I don't know if it'd be worth risking my sanity and license even in this economy.
Sorry to be so dismal, but I'd rather be truthful than to sugar coat things and then have it go sour. But to each his own. Hope this helps in some sort of way. :)