The Last Three & Calculating my Contribution

I just finished sending off lesson plans for the 3 days of next week that we have classes. Our spring break starts Thursday. Then there are only three weeks to plan for when we get back from vacation. Wow, my last three weeks of lesson plans. I just had to check again, and yep, there are only 3 weeks left to plan for and then a week of exams. I wounder how many weeks of lesson plans I have made during my 35 years in the business. I have been  a classroom teacher for about 24 years. At 2 schools where I was the director I had to teach some classes, so I had some lesson planning to do. For the 3 years I taught at a university I had at least one lesson plan a day. A conservative estimate would be 25 years x 36 school weeks/year x 4 subjects or grade levels to plan = 3,600 weeks of lesson plans. I wonder how much was learned from those 3,600 weekly plans. Let's say there were an average of 15 kids in each class and they learned only two things during the week of the lesson plan (I'm not sure that is a conservative estimate, but I'll continue with this math problem) that would be 3,600 x 15 x 2 =  108,000 concepts or skills. I suppose that is in a way a measure of my contribution.