A post-master’s certificate is the best way to bridge from FNP to PMHNP as one of the shortest options for a master’s level education.Our Post Master's PMHNP certificate program can be completed in 20 months, providing current FNPs a fast path to taking the next step in their NP career. Discover the Herzing post master's PMHNP programExplore Now Other Questions Can you earn an accounting degree online? What happens if my FAFSA is selected for verification? Where can you work as an accountant? What are the benefits of working in healthcare administration?