I've been furiously tapping out a several-page-long world with an assload (or, at least an assload compared to most of the things I write) of history, full of different feuds and struggles and cultures. I haven't been sure what I've been doing it for, but the only thing it'll be half useful for in this form is an rp. The thing is, it's a semi-generic fantasy setting at its plainest and I'm not sure people would be interested in reading about it when I plan to make it casual. After all, when there's not a definitive minimum post size, it's very easy to maintain a certain vigilance when running an open world because they tend not to be exceedingly long...

Which is another thing, how would time be handled in an open-world rp that takes place in a landmass about the size of the British Isles put together? It would take a long time for people to travel between some places, and there would be no definitive party, so timeskips would throw each individual's continuity out of whack. I'd like to think I handled time relatively okay in other partyless, open-world games I've done before, but that took place in just a city, and the majority of the characters had supernatural powers. I'd do a single universal time for everyone, but I wouldn't want to give travelers a load of filler/completely improvised BS while people at their destinations are off doing things, and I wouldn't want to make days pass by for travelers going cross-country when it would mean stationary individuals could watch the sun and moon passing by like birds...

I'd make it party-based, but I'm kind of into the idea that everyone would be their own character with their own motivations doing their own things independently or not, like Mount and Blade Multiplayer but with less hacking, more complex NPCs, and an ovreword bit.