It’s a bit complicated since Landscape Materials usually take a bit of time to recompile. I’m guessing your material setup it’s very simple in order to change it in runtime. But I think the only possibility would be using a Material Parameter collection.
To be honest, Seehr, not really. It’s not all that simple but the material will only be changing once every (real world) 10 hours so i don’t think an extended loading time would be too much of an issue for that. there is no transitional material needed. the character goes to be on night and when he wakes it has changed. Think stardew valley season changes if that helps at all.
Thanks for the link JamesEmory, will definitely be taking a look at that ASAP.