Why not 6 months?

I have one post-it note hanging from the monitor in my office.

It says “Why not 6 months?” 

It was born from this quote from Peter Thiel (which you can find in Tools of Titans by Tim Ferriss).

“So if you’re planning to do something with your life, if you have a 10-year plan of how to get there, you should ask: Why can’t you do this in 6 months?”