Follow up to question below.
Your question will vary based on a few factors including how much you are transferring, is your account verified, what day of the week is it, what hour of the day is it, the size of the payout queue, the size of the support queue if there is a problem, the color of "the developer"'s socks, and more.
If you are asking for International wire, that will always be at best about a half day because of the difference in time zones.
For the transfer from Mt. Gox to Dwolla, that can range from very quick (hour to several hours range). Once they do the send though the Dwolla transaction (an account-to-account A2A transaction) is instant.
Then your withdrawal from Dwolla is about two business days, assuming you've already linked a bank account to your Dwolla account. They may do a hold if they decide to require your identity (upload a photo of your driver's license).
