How to adapt UX design approach/process for short timeframe projects (e.g. hackathons)

So I was picked today as a participant for a 24 hour hackathon, I tried to read couple of articles on how to get ready, some of them offered some quality insights but most of them were just about how to get along in the teams and they were almost only purely UX hackathons. I will be in group with Product Manager, Scrum Master, Business Developer and Software Engineer.

I am looking for an advice on how would you choose the right approach on such short given period of time. I know it is different from project to project but how would you for example go with Empathizing and Testing stage when you have only 24 hours to come up with a MVP.