Apple watch timer complication > 24 hours

Hi all, looking for a timer app on the apple watch that shows the days/hours to an event in the future (marathon of Berlin in days)

I have not been able to find such an app.

Any suggestions?
(Displaying the remaining days on the watch face is essential)

If you open the Watch App on your phone, then at the bottom of the app click into the Watch-specific App Store, and then search for “countdown”, you’ll be presented with a number of apps of varying capability that do countdown timing. I think that’s what you are looking for. You’d have to read the info on each for which ones support complications – several of them seem to do that.