Unfortunately you can not add a full countdown timer to a lead generation landing page. You could however use a GIF of a countdown clock as your landing page logo image. With this GIF it will not continuous countdown to your set time but can loop and mimic a countdown effect for your viewers of that landing page.
John M Community & Social Media Support
Did I answer your question? If so, please mark my post as an "Accepted Solution" by clicking the Accept as Solution button in the bottom right hand corner of this post.