I think that the five-year period by statute is a reasonable one if you're going to have a structure for official review, but a review should be ongoing and continuous. Groups like ours are constantly evaluating the trends and how the law is being interpreted and enforced, and then informally briefing folks like you in Congress, so that they're aware of the latest trends and developments.
Our Congress, on average, has oversight hearings for comprehensive assessments of how the law is working about every other year just through legislative hearings like you're having today.