How long does it take for bounced emails to appear in campaign reports?

In most cases, email addresses that have bounced will show up in your report within a few minutes of the campaign being sent.

You can monitor changes to your bounce rate from the snapshot page of your campaign report, as shown here:

Email addresses that have hard bounced typically appear first because a hard bounce is a permanent delivery failure. With soft bounces, which are temporary delivery failures, it can take up to 12 hours for them to appear in your report because that's how long we keep trying to deliver the message.