Just passed PSM 1. Would it take much to pass PSPO?

I want to ride the wave of my PSM1 success and pass PSPO 1.

Would it require much extra effort? I have no Product Owner experience at all, just 10 years Scrum experience as a developer. If it was > than 1 week of effort then I might direct my effort elsewhere.

I regularly pass the Product Owner Scrum Open Assessment 100%.