Sometimes I don't have the time to complete a page in the sketchbook. What I like to do is roughly sketch on a page what I want to record for that day and add the date. When I have time, I will come back and work on the page. Just like these two.
and this one
A sketchbook journal does not have to be magnificent pages of art work, it can be rough little sketches like these to record what you were doing on any particular day.