Early on in my independent study advisory I used this, but it could definitely be used anytime towards the beginning of the year. I do power writing with my students every once in a while to get them to work on writing stamina. Rather than just setting the timer as a time limit, I set it for anywhere from 2-5 minutes (depending on the prompts, grade level, etc.) and challenge them to write the entire time. Some actually come up with some really great stuff!