Gemini Notebook's slide generator is genuinely good — until you ask it for a long deck. Its Presentation feature is still in beta, and in practice it hard-caps somewhere around 20–25 slides per run and follows your requested count most faithfully at about a dozen. Ask for a 45-slide lecture in one shot and you get a deck that quietly stops short, drifts off count, or fails partway through.
That is a real ceiling for anyone building a full lecture, a course module, or a conference talk. Extended and Extra-long — two slide-length modes in the Notebook OS Studio Recipes Presentation recipe — are built to get past it.
Why batching instead of one big run
The honest reason is that the native generator is more reliable in small runs. So instead of fighting the beta with one oversized request, Notebook OS plans one continuous presentation and generates it in small, consistent batches that each stay inside the reliable zone:
- Extended (30–40 slides) — 2 batches
- Extra-long (44–50 slides) — 3 batches
Every batch carries the identical design system — same palette, fonts, and layout rules — and continues the original slide numbering, so batch two picks up exactly where batch one left off. The deck is planned as one arc from the start: no batch re-introduces the topic, recaps in the middle, or adds its own "thank you" slide. Only the final batch closes with a conclusion. You will never see a visible "Part 1/2" marker anywhere on the slides.
How to generate a long deck
1Open the notebook, launch the Notebook OS side panel, and go to Studio Recipes.
2Pick the Presentation artifact and the recipe that fits — a teaching lecture, a conference talk, a case presentation, and so on.
3In the slide-length selector, choose Extended (30–40 slides · 2 batches) or Extra-long (44–50 slides · 3 batches). The shorter presets — Concise (8–12), Standard (15–20), Comprehensive (20–25) — still run as a single deck.
4Run it. Notebook OS sends the batches to Gemini Notebook's Studio one after another. When it finishes you have 2–3 slide decks sitting in the Studio panel — the sibling parts of one presentation.
Premium Deck View chains the batches into one deck
Two or three separate decks in the Studio panel would be awkward to present by hand — clicking out of one, opening the next, losing your place. Premium Deck View removes that seam entirely.
When you launch the presenter on a long deck, Notebook OS quietly detects the sibling batches in the same notebook, walks them behind the presentation overlay, harvests their slides, and appends them in order. Part 1 flows into Part 2 into Part 3 as one continuous deck: the same arrow keys, one slide counter, no exit-and-reopen — and, as always in Premium Deck View, no Gemini Notebook watermark in the frame.
Applications of Large Language Models in modern healthcare
A 48-slide lecture, generated in three batches, presented as one
When you need editable files: the Merge tool
Presenting live from Premium Deck View is the cleanest path. But if you need a single downloadable file — to email, archive, or edit — Notebook OS also ships a small Merge Slides tool. Download each batch from Gemini Notebook as PDF (or PPTX), open the Merge tool, and it stitches the parts into one file, dropping the duplicate title slide so the seam disappears. PDF merging is rock-solid; PPTX merging is beta, so if a PPTX merge misbehaves, export both parts as PDF and merge those instead.
The takeaway
The 20-slide wall was never really about your content — it was about a beta generator's comfort zone. Extended and Extra-long keep the generator inside that zone, and Premium Deck View hides the joins so your audience only ever sees one polished, watermark-free deck. Notebook to a 50-slide lecture, without opening PowerPoint once.