Yeah I’m in Australia and I left my lab notebook by a window over a holiday break. It was probably getting over 50 C daily and the ink all faded. I don’t think it was UV, as multiple pages were damaged, I think the ink wasn’t hugely temperature stable.
It wasn’t like magically gone, but faded enough that my chicken scratch was hard to read. Between that and water damage at various points I figured I’d just switch before something got fucked up beyond salvaging. Besides, you never know what’ll be interesting to future generations. Whether it’s a grandkid paging through something to get a sense of who you were or some researcher going through archives. Archivists ink is non acidic, so it doesn’t destroy paper over time. Idk whether printer ink is.