How long can you take to answer an email?

According to Adriana Girdler, you shouldn’t take longer than 24 hours to reply to an email. If you need more time than that, you should answer the email in order to let the person know that you have received their message and will reply as soon as possible. Watch minutes 2:18 to 2:39 to listen to Girdler’s comments about this: https://youtu.be/oI3rVQFye9w?t=131