I Analyzed 18,868,307 Notes. Here's The Best Time To Post Them.
Avoid the same timing mistakes most creators make.
Most creators post when it’s convenient for them. Early morning after breakfast, right before lunch, whenever there’s a free slot in their calendar.
The data says that’s exactly the wrong move.
I pulled every note in WriteStack’s database — 18,868,307 of them, going back to April 2023 — and looked at exactly when they were posted and how much engagement each one got. The pattern is consistent enough across four years to change how you think about scheduling.
There’s one window in the hourly data that nearly nobody posts in, and it has some of the highest engagement in the entire dataset. Read through to find it.
The Best Days To Post Notes
Peak Performance Windows
Sunday leads with 421.6 avg reactions per note — the highest of any day. Saturday is second at 401.7. Then comes a clear drop: Monday sits at the bottom with 338.2, despite having significantly higher posting volume than either weekend day.
That gap between Sunday and Monday is 25%. A note posted Sunday gets roughly one quarter more reactions on average than the same note posted Monday. Not because Sunday audiences are different people — because Sunday has fewer notes competing for the same attention.
Why this happens
Sunday has 2.28M notes in the dataset. Tuesday has 2.89M — 27% more. Reader attention doesn’t scale up 27% to match. It stays roughly constant while supply floods the feed. Each individual note gets squeezed. Weekends reverse that: fewer creators post, the feed is quieter, and each note gets more room.
Notes With Under 26 Likes
This is the downside chart. Saturday and Sunday have the lowest count of underperforming notes — the share of notes that die below 26 likes is meaningfully smaller on weekends. Tuesday through Thursday have the worst ratio: highest volume, highest share of low-engagement notes.
Posting on a weekday doesn’t just lower your ceiling. It raises your floor for failure.
The Best Hours To Post Notes
Day of week matters, but hour of day is where the real leverage is. I looked at every day × hour combination across the full dataset and measured average reactions per note for each of the 168 cells.
Two things jump out immediately.
The early morning window (3–8 AM ET) is consistently strong across almost every day. This is the counterintuitive finding. These hours have some of the lowest posting volume in the entire dataset — which means any note that goes out faces almost no competition and gets disproportionate reach from readers who are up early checking their feeds.
Sunday 6 AM ET is the single highest-engagement cell in the dataset at 929 avg reactions per note. Almost nobody posts then. The notes that do go out essentially have the entire feed to themselves.
The midday weekday window (11 AM – 3 PM ET) is where engagement goes to die. This is exactly when most creators post — lunch breaks, mid-morning habits, “best time to post” cargo-culting. The data says it’s the worst possible window: maximum competition, minimum engagement per note.
The finding that surprised me most: Friday at noon (12 PM ET) has the lowest avg reactions of any cell in the entire dataset — 125 per note. The same note posted Friday at 6 AM gets 528. That’s a 4x difference on the same day, just by shifting a few hours earlier. Timing isn’t a marginal improvement. It’s a multiplier.
Strategic Timing Recommendations
Volume of Notes
The volume map is nearly the inverse of the engagement map. The darkest cells — peak posting — fall on weekday afternoons and evenings, 5–9 PM ET Tuesday through Thursday. That’s exactly when engagement per note is weakest.
The lightest cells — lowest posting volume — are weekend and weekday mornings before 9 AM ET. That’s precisely when engagement is strongest. Less supply, same reader attention, more reach per note.
Supply and demand, literally
At peak volume (Tuesday 7 PM ET), over 200,000 notes go out in a single hour. At the lowest-volume window (Sunday 10 AM ET), fewer than 47,000 do. Reader attention doesn’t scale 4x to match. The 47,000 notes get proportionally more of it.
How Long Should Your Notes Be
Timing gets you in front of readers. Length determines whether they stop or scroll. Across 18.8M notes, the word count data tells a clear story — with one result that flips what most people assume.
The sweet spot is the 33–64 word range, which delivers the highest avg reactions at 449 — not the ultra-short posts everyone assumes win. A 40–60 word note is long enough to make a real point, short enough to read in one breath. It’s the format that readers will actually finish.
Very short notes (under 16 words) actually underperform relative to the 33–64 range. At that length there’s often not enough of a hook or idea to make someone stop scrolling. They register as filler.
The 65–256 word range is the dead zone — engagement drops sharply. Long enough to feel like work, not long enough to be a real piece of writing. This is where “I’ll write something medium-length” notes end up, and it’s where engagement goes flat.
Notes above 257 words recover and actually get strong engagement (243–344 avg reactions), but the volume is tiny — only 345K notes in the dataset go that long. The readers who commit to a long note are self-selected and highly engaged.
The practical rule: Aim for 33–64 words as your default. That’s one strong thought, fully developed, with enough words to land but not enough to lose anyone. If you’re going longer, commit past 256 words — you’re writing a real piece, and the readers who stick around are your best ones.
Final Thought
Eighteen million notes tell a consistent story. Most creators are posting at the wrong time, in the wrong length. They post on Tuesday afternoon because that’s when they finish writing. They write 80-word notes because it feels like a reasonable middle ground. Both choices work against them.
The data is straightforward: post on Sunday morning or late evening. If you post on weekdays, go early (before 9 AM ET) — not at lunch. Write either a tight 40–60 word note that makes one real point, or go long enough (257+ words) to actually develop an idea. The middle — 65 to 256 words — is where engagement falls off a cliff.
Three changes. The notes that follow these rules outperform the ones that don’t, across four years of data and nearly 19 million notes.
P.S.
Each audience is active on different times. This is a general rule of thumb.
WriteStack tells you EXACTLY when your audience are most active, so you can post at your ideal times. All the time.
And you can use it today for free! Get your 7-day free trial now:
If you sign up for an annual plan in the next 48 hours I’ll set up a 1on1 call with you to plan your Substack growth and build a plan.
Amazing information
I just go with what WriteStack suggests :)