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

Lectio Divino

In Christianity, Lectio Divina (Latin for "Divine Reading") is a traditional Benedictine practice of scriptural reading, meditation and prayer intended to promote communion with God and to increase the knowledge of God's word. It does not treat scripture as texts to be studied, but as the living word. Traditionally, Lectio Divina has four separate steps: read; meditate; pray; contemplate. First a passage of scripture is read, then its meaning is reflected upon. This is followed by prayer and contemplation on the Word of God.