Your Post Has Three Days: The Content Lifespan Rule

The short answer

Almost everything your post will ever do, it does immediately. On Instagram, 76 percent of a single image or carousel post's total views happen in the first three days, and 65 percent for Reels. On LinkedIn, half of a post's lifetime impressions happen within 48 hours. After that, the algorithm quietly moves on.

The numbers

• Instagram posts and carousels: 76 percent of views and 75 percent of interactions in the first three days.
• Instagram Reels: 65 percent of views and 61 percent of interactions in the first three days.
• LinkedIn: roughly 40 percent of interactions on day one for personal profiles, 35 percent for company pages. Half of all impressions inside 48 hours.

Source: Metricool Instagram Study 2026 and Metricool LinkedIn Study 2026.

What this actually means

Three things follow, and they are more consequential than they first appear.

Publishing time is a strategic decision, not an admin one. Posting at the wrong moment does not cost you a few impressions at the margin. It costs you the window in which the post had all of its momentum.

Your first two hours of engagement set the ceiling. Comments arriving early tell the algorithm the content is worth distributing, and that distribution then produces more comments. Arriving late to your own comment section wastes the compounding.

Evergreen content is a myth on social. A post that is still useful in six months is worth republishing, not waiting on. The archive does not work for you the way a website does.

What to do differently

• Publish when your audience is present. Instagram peaks between 7 and 9pm. LinkedIn is busiest between 9am and noon, which is also where the competition is.
• Block 30 minutes after publishing. Reply to every comment while the window is open. This is the highest return half hour in your week.
• Never publish something important when you are unavailable. A strong post published before a full day of meetings is a wasted strong post.
• Republish what worked. After 90 days, a good post is new to most of your audience.

What to do this week

Look at your best post of the last three months and check what time it went out. Then check your worst. The gap between them is often nothing more than timing.