We all have half an hour here or there which could be utilized for writing very short pieces for publication. Well quite a few actualy. Here are just some of the 'slots' available in various publications which can be filled with just a few minutes writing.
Features There are many types of feature that are a page or less when published.
If you are wanting to write medium length articles aim for the 1000 word mark. Shorter articles can go down to the 350 word mark. They are still viable in their own right, however. When you are writing short pieces, you can focus on anything. The sky s the limit.