Creating filter for tracking number of days an entry was made

I am required to make data entries each day for the length of my contract. However, many days require multiple entries to classify the type of work performed. I would like to be able filter my entries to determine if I did in fact make an entry for each day, and not accidentally skip a day. I don’t need to include every entry made but “number of days at least one entry was made”. If this total matches my required contract days then I can verify all entries were made.