I am sure this has been asked before, but I couldn't find anything. How long did the Oblivion Crisis last for? I know technically it depends on the player and how long it takes them to do the main quest, how sidetracked they get, etc. But I mean in lore terms, involving realistic travel times, logistic delays, and a character who doesn't say "oh, important quest to save the heir from a burning city? Nah, I'll do that later, but first I have some dank caves to explore. Oh! a peanut!" I'm guessing it would take a few years at least, but that is just a complete guess.
Regards,
Kashaaz