Every time you ask for a review (1 Karma Point) your case study will be available for review for others. There is no limit on the number of reviews you can receive on a case study. However, to make sure everyone gets feedback on their work the list you see on the Reviews page is ordered by the number of reviews a case study has. So if you already got 3 reviews on a certain case study, other people's case studies with no reviews will appear before your case study on the list. You can also send in multiple case studies for review at the same time, you don’t have to wait for receiving a review to ask for feedback on another case study.