According to black belt wiki, there are approximately 115 techniques in krav maga (assuming the wiki is accurate, and I didn't miscount). Although I suppose technique should be defined: in my counting, each strike counts as a technique, and each defense used counts as a technique as well. I would assume they have more techniques than that as well, but as I don't practice KM, I can't state that. Based on the 115 techniques, and 156 hours needed for certification, they need to spend 81 minutes on each technique to be certified. That probably sounds like a lot, but IMO it's not, as it is very easy to forget something you spent basically an hour on, especially if you then go on to learn something else immediately afterwards. The hope probably is that after you spend an hour on it, you spend x amount of time training it, but I don't see any sort of renewal process to confirm you still know the material a year or so down the line, and if you don't practice constantly its not going to stick with you.
So while Krav Maga is easier to learn than other martial arts, I don't think that 115 hours is enough to actually be qualified to teach it.