A comment that says "how much is this?" loses value every hour it sits unanswered. Reply to buying comments within a few hours, to everything else within a day, and sweep old posts once a week to catch what slipped. That rhythm is the whole fix.
TLDR: Comments are most valuable in the first hours after a post. Use four reply windows, run a 15 minute sweep every day, and send a short rescue message to leads you already missed.
We cannot give you a precise half life for a comment, and nobody honestly can: it depends on the platform, the audience and the product. The pattern is the same everywhere, though. The person who asked is in the feed right now. A day later they have forgotten the question, and a week later they bought from someone who answered.
The four decay windows
Treat each comment by how fast it spoils.
| Window | Which comments | Target |
|---|---|---|
| Hot, first hours | Price, availability, "where can I buy", "do you ship" | Reply within 2 hours in work hours |
| Warm, same day | "Tell me more", how it works, compare questions | Reply the same day |
| Cool, 1 to 2 days | Compliments, tags, reactions | Reply when you can, a like is fine |
| Cold, a week or more | Old questions on older posts | Weekly sweep, rescue script below |
The window depends on the question, not on how many likes the comment has. A comment with zero likes asking for a quote is worth more than a comment with 200 likes saying "so cute".
The 15 minute daily sweep
Set a fixed time and a timer. Then:
- Open your most recent five posts and sort by newest comments.
- Reply to every hot comment first.
- Hide spam and skip the noise.
- Tag any comment that needs a human with sales or support.
- Stop at 15 minutes. If you are not done, the backlog tells you about staffing, not about discipline.
Do it twice a day in the first 48 hours after a big post.
Rescue script for leads you already missed
Once a week, scan comments older than three days for open questions. Reply under the comment with a line that is useful on its own, then offer a private follow up:
"Sorry for the slow reply, Maya. Yes, we ship to Canada in 3 to 5 days. Want me to send you the sizes?"
Three rules for it. Apologise once, briefly. Answer the question in the same line. Make the next step one tiny action. Most missed leads will not reply. A few will, and those are free.
Let automation catch the first reply
You cannot sit in the comments all day, which is exactly why decay is a problem. Mydrop's trigger-word automation can react to words like "price" or "link" in a comment, and the social inbox lists comments across connected channels so nothing hides on a post you forgot. Use automation for the first reply and a person for the second. Never let a bot answer a complaint.
Measure the one number that proves it works
Pick the 30 most recent hot comments. For each, write down the minutes between the comment and your first reply. Take the median. Write it on a sticky note. Repeat monthly. The goal is a median under your target window, not zero.
In Mydrop's data, a typical Instagram post sits between 1.1% and 6.7% engagement, so even a "normal" post can hold dozens of comments that deserve a look. Volume is rarely the issue. Sorting is.
Why replies on old posts still matter
Platforms keep showing older posts to new visitors, and people read the comment section before they buy. An unanswered question under a three-week-old post tells every visitor that nobody is home. Answering it late, with a clear line, fixes the signal for the next reader too. Pin or reply to the best answer under your most visited posts so new visitors find it first.
Run your first sweep today
Open your last five posts. Find every comment that asks a question and has no reply. Answer the hot ones with the rescue script, put the rest in the weekly sweep, and set a daily 15 minute timer. If you want comments from every channel in one list, start free with Mydrop.
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