The evening has two practices, both taught earlier. Together they take about twenty minutes.
The review
Sit or lie down, and walk the day backward, scene by scene, from now to the morning (pages 17 and 32). Do not judge. Simply see. Where were you awake? Where did a self take over? Where did you give, and where did you only take?
The meditation on one self
Choose the self that showed itself most clearly in the review. Sit with it in stillness and understand it: what it wanted, what it feared, how it arrived (page 30). Then ask for it to be taken (page 31).
Then let the day go. It is finished. Anything undone can be done tomorrow. Do not carry it to bed.
The books add a reason to make this a habit. They teach that after death each person reviews the life just lived, scene by scene. The evening review is the same act, done each day, while there is still time to change.
If you are very tired, keep only the review, and keep it short. Five honest minutes are worth more than a perfect half hour that never happens.