It is possible to have more than one service business if the time requirements are small for each. It is better if the services are related, or at least a logical association. We have a pool service. We clean and maintain swimming pools for homeowners. In addition to that service we repair pool equipment.
Repairs are infrequent so there is enough time to schedule one or two repairs a week.
The third revenue stream we have is retailing pool chemicals to our service customers. This only takes a few minutes at each stop. Adding these additional revenue streams has increased our bottom line without having to find new customers for a new business. There aren't any scheduling conflicts with our main service, because of the low time requirements of the other services. This leaves evening hours for us to pursue other businesses.