Jun 23, 2015

How long can Google “undo send” gmail and how do I enable this function?

You can choose to have from a 5 to a 30 second delay.

To enable Undo Send:
1.Click the gear in the top right .
2.Select Settings.
3.Scroll down to "Undo Send" and click Enable.
4.Set the cancellation period (the amount of time you have to decide if you want to unsend an email).
5.Click Save Changes at the bottom of the page.

Here's Google's support page on this: https://support.google.com/mail/answer/1284885?hl=en
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