I've survived over 500 days on my own world (maybe it's not much or not little, I don't know lol), and it's the only one I've had since starting the game shortly after its EA launch. Save corruption can obviously be a big issue, but it's never affected me during this time, maybe I've just been lucky. It's also possible to take backups of your world and character data just by copying files in AppData, if I'm not mistaken. I've also had good fortune in that I've always managed to find the new additions to existing biomes relatively easily (tar pits and frost caves), so even that experience can be subjective. :)