How long to go from idea to execution for a trip?

With Yellowstone, I always had in the back of my mind. When the time came to plan, which was 2 years prior, I had some ideas. I just started doing a lot of research on where and what to do. A 2 week 4000 mile trip takes time! Other trips are usually a year. And normal trips are about 6 months.

It all depends on the destination!