Ten minutes is manageable for most of us. It’s not too much, and not too little. Feel free to write for longer. Set your timer for twenty, fifteen, or thirty minutes and keep your hand moving.

Another variation to consider is taking the same prompt multiple times in a row with a fresh start each time. For example, if the prompt is “suddenly I knew,” set your timer for five minutes three times and step through that door with a clean slate each time.