You can even manage as many as you like,the problem is trust, because I am certain you can't be in the business at the same time,so you will need a manager.
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This is also what I think about because there is no way that one person can be able to manage three businesses if the business is 2 I can say that it is possible that one can manage to business in both for 3 business is it it is absolutely impossible for one person to manage them.There is no way you can manage the three business by yourself ,it will be better that you put people there to help your control two of them why you monitor their activities .
Did I hear you say automation?how do you expect that to be done?well the world now is full of technology maybe that can be done but another method is get your close relative learn him the business and live some part for him to manageIf you want to manage multiple business at one time, the only way you can do is through automation. You will have to automate your business so that you have tools, programs and software to manage and run your business.