We can prolong the time we sit in prayer as long as we feel the need to, till you feel you got an answer, an insight, that can help you cope with the problem, or enjoy better life.

Longer ways to pray alone or in group can be through following a course on

The Spiritual Exercises of St. Ignatius of Loyola

Divided into four thematic "weeks" of variable length, they are designed to be carried out over a period of 28 to 30 days. They were composed with the intention of helping participants in religious retreats to discern the will of God in their lives, leading to a personal commitment to follow Jesus whatever the cost. Their underlying theology has been found agreeable to other Christian denominations who make use of them and also for addressing problems facing society in the 21st century.