This is an activity that can be practiced daily or weekly in a journal. I would allow 10 to 15 minutes, depending on the grade you are teaching. It always takes longer when introducing a new activity. This could also be used when you have a rare unplanned 15 minutes of class time.
I was thinking how students love to learn when they are having fun. This is a silly activity of choosing three random words (specifically NOUNS) and determining how they can be related, then write a 5 sentence paragraph with a TOPIC SENTENCE, CONCLUSION AND 3 SUPPORTING SENTENCES that use the seemingly random nouns. This is also a great way to practice writing topic sentences and a conclusions. Often kids struggle to understand what the main idea of a story or passage is about. Here they get to use their imagination about how the supporting sentences are related.
I have included the directions, a starter set of words and a template to be printed on card stock and cut into a card deck.