How many hours you devote is an individual choice but there is always more to do. If having your weekends free or wanting to work nine to five is your preference, being an entrepreneur is not for you. Third is a willingness to take risks. You will invest a lot of money, time and self into an idea or a business you believe in. But success is not certain.
Most new businesses fail.
The risk involved might be that at the end you will have lost your investment in money, time and ego. Finally, there must be a belief in what you are doing. Unless you believe in what you are doing, you will find it hard to justify the self-confidence, the work and the willingness to risk. For me there are four main motivations. First is the tremendous satisfaction you will get from implementing your own ideas and from when they succeed just the way you think they will.