A review that will not say whether the thing is worth your time is not a review. It is a description.
The verdict block is the most argued-over part of the format. Here is why it is mandatory, why it is a number and not stars, and why "selectively" exists.
The limit is editorial, not technical. Here is what it forces, and what happens when a subject will not fit.
Every brief runs under 15:00. The ceiling shapes the script before a word is written, and it is the reason a brief is one argument rather than a tour. What we cut, what becomes two briefs, and why the number is not going to move.