Just tried depositing $10 from Dwolla into CampBX, to test the waters. Dwolla lists the deposit as sent and completed. My CampBX account still hasn't shown the money in my balance.
I read their website's FAQ, and nowhere does it state how long a Dwolla deposit would take to get credited.
As Keyur has already said, the FAQ states that transfers can take up to 6 hours. I recently deposited $450 from Dwolla and the transfer cleared within the specified timeframe.