I've been writing Morning Pages (3 x A4 pages, hand-written) every day for almost three years. Sometimes I do them in the afternoon or evening, or right before bed.
Sometimes I'll only do one page, sometimes ten... A month or two ago I spent a month writing about 20 pages a day of "morning pages" after a few intense experiences.
After a month or so I didn't need to think about it any more, and now I can't imagine not doing it. Every morning, wake up, make coffee, write, then start the day. I find my life is richer and deeper as a result.