Yes! You can track up to half an hour per session you review.
As you review sessions, you will have the opportunity to confirm how much time you spent on each review, which will get automatically added to your volunteer hour tracker. It is up to you to track the time you actually spend; don't simply track 30 minutes each time. You are liable to get peer reviewed to ensure that your reported hours align with how much time you spent peer reviewing. Deceptive reporting of hours will be escalated and may render your community service hours invalid.