Sesshin

Zen traditions include periods of intensive group meditation in a monastery. While the daily routine in the monastery may require monks to meditate for several hours each day, during this intensive period they devote themselves almost exclusively to the practice of sitting meditation. The numerous 30–50 minute long meditation periods are interleaved with short rest breaks, meals, and sometimes, short periods of work should be performed with the same mindfulness; nightly sleep is kept to a minimum: 7 hours or less. In modern Buddhist practice in Japan, Taiwan, and the West, lay students often attend these intensive practice sessions, which are typically 1, 3, 5, or 7 days in length. These are held at many Zen centers, especially in commemoration of the Buddha's attainment of Anuttarā Samyaksaṃbodhi. One distinctive aspect of Zen meditation in groups is the use of a flat wooden slat used to keep meditators focused and awake.