I am working on a (second) memoir and it's taking forever. I attribute it to the length (much longer that the first), the content (much more serious) and the extensive research. My first, published in June of this year, was humorous, light, and dealt with more recent events. My WIP scan 50 years or so, starting in the early 1900s and approached characters in more depth. It also has a universal theme or message, unlike the first.