How Long Can Employees Go Without Coverage?

Our hotel is currently entering a transition stage with management, our new insurance will not kick in for our employees until 45 days after the new company takes over. Therefore, our associates will not have insurance for 2 months. We are wondering if they will be penalized for this gap? If not, what are the proper steps they must take to not be penalized?

Any information will be helpful, as we have 200 employees who will be uninsured as of June 1st.