The numbers
| Limit | Value |
|---|---|
| Private replies to post and reel comments | 750 per hour per account |
| Send API, text and links | About 100 calls per second per account |
| Private replies per comment | 1, within 7 days |
| Messaging window | 24 hours after their last message |
From Meta's Instagram Platform documentation at the time of writing. Meta can change limits; good tools read the rate limit headers instead of trusting fixed numbers.
What happens on a viral reel
If 5,000 people comment in an hour, a tool can reply to about 750 of them that hour. The rest queue. Because each comment stays eligible for 7 days, a well-built queue catches everyone. See DM everyone who commented on a viral reel.
Plan limits vs Instagram limits
Tools add their own caps on top: monthly DMs or contacts. FameChamp Free allows 500 DMs a month; paid plans have no monthly cap beyond a 50,000 DMs per account fair-use pace.
Frequently asked questions
How many DMs can I send per day on Instagram?
For automation, the binding limits are per hour (750 private replies) and per person (one per comment, 24-hour window), not a daily number.
Can I DM 1,000 people at once?
Only people who commented or messaged you, and only as fast as the rate limit allows.
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