Hey, yeah, another heads up, or something - that's definitely more of a 10-15 hour walk... I mean, maybe if you're a trained person, I'm not but I walk pretty fast from what I've gleaned on the internet, and that's... And you should never overestimate you abilities on such occasions (or your clothes and footwear, your bladder, etc). At least a place to stay overnight around the museum... I hope you haven't left yet.