I'll be earning instructor licenses this spring at my local FBO. I'm trying to estimate the length of training (in flight hours) for CFI, CFII, and MEI. Anyone care to chime in about training took for each of these licenses? I've heard there is more ground instruction with the CFI compared to other licenses because the student is demonstrating teaching skills to the instructor, is this the case? Also, how challenging is the FOI in comparison to other licenses?