My Dwolla validation took around 4 days.
Well, Dwolla themselves have their "bank account verification" where after you link your bank account they send a small amount as a direct deposit and you verify by giving verifying to Dwolla the amount that they transferred to you. That will take from four days to more than six business days, depending on Dwolla's backlog.
Dwolla then also identify verification, which some but not all accountholders are required to comply with to continue using the accountholder's Dwolla account. That can take a couple days to several days, likely depending on Dwolla's staffing level as well.
So there is verification on Dwolla's side.
But the question above was referring to the delay on the Mt. Gox side for getting verified (Level 1).
That isn't specific to "Dwolla", but all Mt. Gox customers wishing to use Dwolla for deposit or withdrawal must be verified (Level 1) first. That process (submitting a photo ID, etc.) can be something that happens fairly quickly -- the same day even in many cases. Those reporting longer delays with that include those whose documentation had issues, or submitted where processing crossed over a weekend or included holiday and thus ended up being multiple days.
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http://en.bitcoin.it/wiki/MtGox#AML