Yes, that's typical. Until you build up a queue you won't get a steady flow of validations. The reason for that is some work units get validated in a day, while others take a week or more. If you have only a few work units awaiting validation, it may be days before they are approved. You're somewhat at the mercy of the other person who's crunching the identical work unit. If he or she has a very slow machine, it will take longer for them to crunch and return that work unit. Worse yet, if that person has an error, then another identical work unit has to be sent out to another user.