How long does it take for business owners to make a successful business?

That depends on your definition of "successful". But if you are talking about how long it will take to become profitable then that is a question that should have been addressed in your business plan, developed prior to the opening of the business. Your business plan serves as the model and will show when you need to become profitable. Typically businesses have a period of time after opening to become profitable, which means it is surviving on the initial capital invested during that time. Therefore, it is important to measure the realty against the model and understand the variances measuring the monthly financial report against the budget. Making a business successful is unlikely since 90% of new businesses fail within the first 5 years. Also, the average business life span is 7 years.

If it is a restaurant you will have more success than other types of business and will make more profit.