It depend on the type of business and your experience on the business you intend to merge together , but you having more than a two I don't really think you can manger that on your own employing people would be the best option for you .
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The thing is you should not be the only one managing your business. If you have 2 or 3 businesses you should have trusted people that will help you manage them. So you can even manage 5 businesses at once if you have capable help.Managinh different and too many businesses might be risky and is not advisable because you can lose focus on all of them. However, if one can find different people to oversee the businesses then there won't be any problem. It's like trying to appoint different people to help you manage your business.
In this case, one can run as many business as possible
Having a life coach is another incredible angle that makes running various businesses possible. Coaching gives an incredible angle to things unimaginable ideas which are useful to running various businesses.Without an incredible coach helping you manage your responsibilities, it's almost impossible to run various clients. In some cases, hiring an assistant to help you keep track of your various responsibilities may even help. You want to spend time on significant work when running multiple companies.