It looks like Mt. Gox is responding, but if they learn anything look at all the frustration by customers here trying to get their money.
According to Mt. Gox's website :
Withdrawals typically take 2-5 full business days to reach your bank, provided that you have included all required information such as your full name and address as it appears on your bank statement.
From support
Usually it will take 12 business days for the International wire transfer withdrawal to be processed
I still have not received my money.
This is likely not what you want to hear but the two statements aren't in conflict. It takes them 12 days to PROCESS your withdraw and then 2-5 business days for the international wire to clear your bank. 4 days is the most common. So 12 + 4 = 16 days. You likely will get your money ... in 2 to 3 weeks. Also yes MtGox prices are consistently 2% to 4% above other exchanges and the illiquidity of outgoing USD is part of the problem. Lots of buyers and less (relatively speaking) sellers leads to higher prices.
Then again I am a competitor offering same day wire service (yes same day) so take everything I say with a grain of salt.