Looking for an excuse to start/continue the works of Sir Terry Pratchett? Here you go! You can read Discworld in any order but Pratchett recommends starting with Mort and many fans recommend Guards! Guards! or Equal Rites.
I decided to put no time limit so you can (and should) take your time with each of these works. This also means you will have an easier time fitting them between other challenges you've chosen to do.  My knowledge of which book was published when comes from the fandom wiki as I've not yet located or read every book myself yet.