1 year to talk to people in real businesses that aren't in tech and study their problem in depth.

4 years to create what they need.

Too vague? I don't know enough about enough things outside of tech to really build something that would actually help the rest of the world. (The only thing I can think of is another Skype-like company akin to Twillio but for video communication with a phone. That probably would fail until costs come down.)