If the countdown clock is a gif image, you can take the image URL and insert it into your email. Just drag in an image block, click on it and hit edit, then plug in the image URL and it will appear in your email!
Hello @RaymondN25 ,
At this time, there isn't a way to add a countdown timer with a set time in an email. One industry-wide practice that's become more commonplace is to not allow these sorts of live-update additions directly in emails (most email clients spam filter emails with these live aspects). With this in mind, you can still host such a countdown timer on your website, if you have it set up. You'd just need to link to the corresponding webpage with your timer.