It's the night section of every exam week: a three-hour recorded lecture, an exam tomorrow, and the terrible arithmetic of watching at 2× while retention drops toward zero. Re-watching is the worst-evidenced study strategy there is, and under time pressure it's the one everybody defaults to — because the alternative (distill, then self-test) requires the hours you no longer have.

The efficient protocol is known: compress the material into notes, test yourself against it, and spend remaining time only on what you failed. The bottleneck was never the protocol; it was that steps one and two each cost more time than the re-watch. Not anymore.

run_youtube_tool runs the protocol directly on the lecture's URL. study-notes produces the distillation — structured, complete, from what was actually taught. quiz-generator produces the self-test: active recall against the lecture's real content, which is worth more per minute than any amount of passive review. chapter-generator maps the three hours, so when the quiz exposes a weak spot, you rewatch eleven minutes, not three hours.

The night restructures: twenty minutes reading the notes, twenty testing, and the rest targeted at your actual gaps. Same lecture, same night — the difference is that every minute now runs through the high-retention path instead of the 2×-blur one.