Not to be a troll but this really irritates me and its hapening more and more in the "start up" community. This is not a startup. Its a landing page. There is no such thing as a 4 hour startup. This is a side project.
My first though when reading the title was if it only takes 4 hours it will take a better funded competitor 2, when you prove out the market for them. Seriously unless it is some really specialized technology and knowledge, 4 hours mean the entrance barrier is just too low. Every kid in his garage will be giving it away for free.