Obsession.
[uhb-sesh-uhn] 1505–15; L. obsessiōn- (s. of obsessiō) -noun
1. the domination of one's thoughts or feelings by a persistent idea, image, desire, etc.

I've lost two weeks of my life and I really don't care. I wasn't doing too much with it anyways. In it's place, I lived a life of amazing adventure and heroic deeds. I bought the world and became a king. What did you do?