How much of each feed goes into a summary?

Each feed contributes its newest posts — up to 15 of them per feed, and only posts from the last 50 hours. If a channel published 3 videos in that window, all 3 can make it in; if it published 40, you get the 15 newest.

A summary is a current brief, not an archive. The 50-hour window is a little over two days, so anything you'd reasonably still catch up on is eligible — while anything older is intentionally left behind rather than quietly filling your brief with stale posts.

Why a 15-post cap per feed?

So one very loud account can't eat the whole summary. Fifteen posts is enough to cover a busy day for almost any channel, and the cap keeps the rest of your feeds' posts in the same brief instead of crowded out.

Do the numbers ever differ?

Yes — your very first summary on a new account looks back further (100 hours) so it has something to show on day one, and a plan can change how many sources a single run reads in total. The window and per-feed cap above are the defaults everything builds on.

How Feeds Are Summarized — The 50-Hour Window and the 15-Post Cap

WHAT MAKES IT INTO THE BRIEF

Follow enough channels and the brief stops being “everything” and becomes a question of selection: what even counts as new? The answer is two rules, and they apply identically to every feed you follow — a YouTube channel, an X account, or a subreddit.

THE 30-SECOND VERSION

Two rules govern every feed: a 50-hour window and a 15-post cap — quiet feeds add nothing, loud feeds are capped, not excluded
The 50-hour window means only posts from the last 2 days are eligible
The 15-post cap takes the newest 15, so one loud account can’t eat the brief
Links you paste as sources ride along — the window and cap apply to feeds only
Your first summary looks back 100 hours instead of 50, so day one isn’t empty

TWO RULES, ONE JOB

Every feed you follow contributes to your summary on the same two rules, whether it’s a YouTube channel, an X account, or a subreddit. Together the two rules do one job: your summary reflects what’s new, not what’s accumulated.

If a feed is quiet, it contributes nothing that day. If a feed is loud, it’s capped so the rest of what you follow still fits.

THE 50-HOUR WINDOW

Only posts from the last 50 hours — a little over two days — are eligible. Older posts stay where they are; your brief stays current. Anything you’d reasonably still catch up on makes it in; anything older is intentionally left behind rather than quietly filling your brief with stale posts.

THE 15-POST CAP

At most 15 posts per feed, always the newest ones first. A feed that published 40 things still contributes 15 — never the whole firehose. The cap is what keeps the rest of your feeds’ posts in the same brief instead of crowded out by one very loud account.

WHERE PASTED SOURCES FIT

Posts you hand-picked as sources ride along in the same summary — the 50-hour window and the 15-post cap apply to the feed side, not to the links you paste. A video from 4 months ago works fine as a source; it just isn’t a feed post, so the window never rejects it.

THE FIRST-SUMMARY EXCEPTION

The first summary on a new account looks back 100 hours instead of 50, so day one isn’t empty. After that, every summary uses the regular window.

How Feeds Are Summarized