As of the date of this post, there is no legislation in place (and no continuing education requirements) related to the regulation of the Interior Design profession in the state of Michigan. 

Statute law is subject to change and varies across jurisdictions. Always check and comply with current statute law in place in the jurisdiction(s) where you plan to practice Interior Design or use that professional title. 

Licensed Michigan architects are required to complete 24 hours of Continuing Education in every 2 years.