If one is looking to simply trade in forex, then it is very easy. Learn how to trade daily a few hours, go back to sleep after making some decent money. If one think of starting a business, your entire life will be given to it. that means there is no fixed time you spend on anything, because there are days it takes away all your time and resources. one must look for what one can work with comfortably and has an understanding of it, if it is your business. once the business stabilizes, one can deploy time gainfully elsewhere, but still have to have full control on many things involved.