How many lines depends as I break different actions and thoughts up by paragraphs. I generally do at least half a page, lengthy answers as I'm talking to myself, asking questions and answering them all in a way that only I hear. I do it this was a when I read it back days after, I know exactly how I was feeling by the words and how they sound reading them back. There's no point if your not using your authentic inner voice.
I write a few sentences about my day. Then i write my gratitude and intentions. Then i write a line for each word- mind, mood, food, body and sleep. Then I write how I've taken care of myself that day.