I agree that passion lasts longer than mania. However, differentiating between passion and mania can be difficult when you're first becoming passionate about something. In that case, I'd say that it depends on the intensity of your "passion." Are you suddenly going to sell your house and live off the streets so that you can devote your entire life toward saving all the homeless kitties? That's pretty intense. Or, are you going to keep your house and devote some of your time toward saving homeless kitties?