Actually, the ten-day course is the minimum; it provides an essential introduction and foundation to the technique. To develop in the practice is a lifetime job. Experience over generations has shown that if Vipassana is taught in periods of less than ten days, the student does not get a sufficient experiential grasp of the technique. Traditionally, Vipassana was taught in retreats lasting seven weeks. With the dawning of the 20th century, the teachers of this tradition began to experiment with shorter times to suit the quickening pace of life. They tried thirty days, two weeks, ten days, down to seven days–and they found that less than ten days is not enough time for the mind to settle down and work deeply with the mind-body phenomenon.