How would you do it if you were to launch a landing page in 24hrs?

Bubble has a handful of templates that are quick and easy to use in the template marketplace. For example, I've thrown this together in the last 22 hours: shorturl.at/etwQS

I'd focus on the copy and ditch the rest. Whatever the reason is to launch such a page in such a short amount of time, best is to focus on what moves the needle: copy. Actually, this would be a great project for any team: remove any kind of design on your homepage, and focus on the story you want to tell.