Short answer: NotebookLM is now called Gemini Notebook in Google's help pages. The free plan allows up to 100 notebooks and 50 sources per notebook, with each source up to 500,000 words or 200MB. Everything else (chat, Audio Overviews, reports) now runs on a usage budget that refreshes every 5 hours until a weekly limit. Google doesn't publish daily counts, so older "50 chats a day" figures are no longer official. NOTEBOOKLM / GEMINI NOTEBOOK Limits explained Sources, usage budget and plan caps 50 sources 5-hour refresh Weekly limit usage --window rolling 0h 1h 2h 3h 4h 5h > refreshes every 5 hours, then weekly cap > Standard: 50 sources per notebook > check: Settings / Usage _ AI Tool Brew In this guide Notebook and source limits by plan Usage limits: the 5-hour and weekly budget The old daily numbers you'll still see How to check...