We have no objection to multiple successive questions from the same person. We do have an objection to questions that don't show any research effort. If you can post 20 questions that are well-written, show research effort, and are on-topic, then we really don't care whether it took you 10 minutes or 10 days. (Keep in mind, though, that it's extremely unlikely that a question that took 30 seconds to write is going to be of acceptable quality...)
Edit: Thanks to Carlo_R's memory, I've looked it up, and apparently there is a limit: six questions per day. Why are we limited to six questions per day?
Edit2: Nevermind, scratch that, apparently the limits only apply to the "trilogy" sites (stackexchange, superuser, and serverfault).