To put up with an unpleasant thing without actively doing anything to stop it. In which case...let's see. I would not consider taking over a tower in the middle of a city and ensuring that no one could get inside and survive without my express permission tolerating it, nor would I say that attempting to become a god and nearly killing everyone in the process was tolerating it. And here I have not tolerated it, seeing as I have poisoned the only person to cross me to an extent that I felt it worth my time.

However, prior to that my childhood was spent tolerating it, and I even showed an incredible display of tolerance when I simply left a city where I nearly was burnt at the stake when I was nineteen instead of attempting to kill everyone responsible, though that was primarily because I didn't have the level of power I do now. And for the six years after that I begrudgingly tolerated it, I suppose. I wasn't pleasant toward others, but I did nothing in regards to their constant suspicion and dislike.

So that would make it twenty five years.