All the time since I was 10. Think of ODing, slitting my wrists, hanging...that's more for strong urges. When I'm less emotionally involved in it, I think about night night method (which is my chosen method). Planning, visualizing, preparing. And also random stuff like "Oh, I should jump out of this car and onto the highway" or "Let's walk into traffic." As for frequency, every day, most of the day.