This is a must have feature. The point of the dynamic timer should be to work immediately when they land on the upsell page, and not be reliant on an email or Whatsapp trigger. This functionality already exists in competing products and is essential to make timers truly useful.

We need the option to extend the countdown timer to days, so we can set the elements to a day/week duration and then hide them or show them. The custom countdown doesn't have the option to do a hide/show and the built-in max time is 12 hours

You can do this in the page builder. It just wouldn't be the same timer in emails you send.