If you are a young entrepreneur or starting a business from scratch, there is no such thing as Friday's and Forty hours. You need to work until the work is done. Make hay while the sun shines, that's not just a saying, it's an actual statement of what needs to happen. Get used to structuring your entire life around the health of your business. Plan on always being on call for whatever part of the business needs your attention. I think when entrepreneurs are young and ambitious, but lack experience, they have a distorted view of how much actual work will be done by them and them alone. NOTHING can be built in 40 hours, over a five day work week, especially if you are building an empire. Those building empires don't have timelines. Their week doesn't start on Monday, and end on Friday. The ultimate goal is to have financial freedom, freedom from time, freedom to do the things in life that can only happen with entrepreneurial independence. It's easy to be blinded by grandiose ideas. But you will put more work in, then you ever thought imaginable. Any business takes a minimum of three years to start making some type of profit, if you're lucky. Plan on three years, 36 months of 100 hr work weeks, 3600 hours. That's a start. Unforeseen problems are inevitable regardless of how streamlined your business plan is.